Breakaway

• written by George Bellak
• directed by Lee H. Katzin
• music by Barry Gray
  additional music by Vic Elms
• Story: Commander John Koenig is hand-picked to take over at the manned lunar colony Moonbase Alpha, the site of the impending launch of an interstellar probe to the planet Meta, and also the site of a slowly spreading epicdemic that endangers that mission. When Koenig arrives, he finds a supportive old friend in Professor Victor Bergman, and a somewhat perturbed chief surgeon, Dr. Helena Russell. Dr. Russell has been diagnosing the victims of the outbreak as they progress from mental aberrations to a comatose state and finally to death, and she has made a few discoveries - but all of her recommendations have gone unheeded (and worse yet, have been considered unfounded) by space program commissioner Simmonds. Koenig soon finds that Simmonds has been ignoring any reports that don't indicate a perfectly normal situation, and decides to force the commissioner's hand by bringing him to Moonbase Alpha in person.

  Following Dr. Russell's leads, Koenig postpones the launch of the Meta probe and leads an investigation into strange happenings at the station's nuclear waste facility, where unwanted material from Earth is being stockpiled until scientists can figure out what to do with it. Koenig finds out only too late that far too much nuclear waste has been shipped in from Earth, setting up an unanticipated electromagnetic effect that accounts for the strange behavior of both equipment and crewmen. An emergency operation is set up to disperse the material, but the procedure goes horribly wrong - a colossal nuclear explosion generates enough force to push the moon out of Earth's orbit, destroying the Meta probe's launch facility and inflicting massive damage on Moonbase Alpha in the process. With the base's communications down, and the moon plummeting through deep space too fast for any rescue ship from Earth to catch up with it, Earth presumes all hands have been lost - and Commander Koenig and his crew have a new permanent assignment
  ...whether they want it or not.

• Season One Regular Cast: Martin Landau (Commander John Koenig), Barbara Bain (Dr. Helena Russell), Barry Morse (Professor Victor Bergman)
• Guest Cast: Roy Dotrice (Commissioner Symonds), Prentis Hancock (Paul Morrow), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Philip Madoc (Commander Gorski), Lon Satton (Ouma), Eric Carte (Collins)
• Originally broadcast: 4 September 1975

Force Of Life

• written by Johnny Byrne
• directed by David Tomblin
• music by Barry Gray
  additional music by Vic Elms
• Story: Technician Anton Zoref starts his day on Moonbase Alpha like any other, but unknown to him, the rest of the base has been frozen in time - an event corresponding with the arrival of a glowing blue cloud of energy. It simply passes through the moonbase's walls and takes Zoref over. When the rest of the crew begins moving again, they have no memory of the blue energy that they observed approaching the moon. When Zoref awakens, even he seems normal - until he shorts out a medical monitor as Dr. Russell gives him a routine checkup. That's just the beginning of the strange signs Zoref exhibits. He now seems to be able to drain energy from any source on the moonbase, and his hunger for that energy is beyond his control. When Zoref's abilities grow to include draining energy from other living beings, Koenig declares him a deadly threat and reluctantly orders his termination. But when Koenig powers down Moonbase Alpha's reactors to starve the creature that is now stalking the corridors, will he really risk the lives of everyone on the base to carry out one death sentence?
• Note: This is the first episode (in the original broadcast order) to mention Professor Bergman's artificial heart.
• Guest Cast: Ian McShane (Anton Zoref), Gay Hamilton (Eva), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), John Hamill (Mark Dominix), Eva Reuber-Staier (Jane)
• Originally broadcast: 11 September 1975

Collision Course

• written by Anthony Terpiloff
• directed by Ray Austin
• music by Barry Gray
  additional music by Vic Elms
• Story: An asteroid is plummeting toward the moon, and a last-ditch effort is underway to plant nuclear explosives on the rock to destroy it before it collides with Moonbase Alpha. During the flight to deposit one of the last bombs, Alan Carter's Eagle runs into technical problems, delaying the all-important timed blast. Commander Koenig is forced to detonate the asteroid before Carter is clear of the blast radius. Despite Bergman's warnings about debris and residual radiation, Koenig insists on leading a recovery mission to find Carter - dead or alive. Aboard the rescue ship, Koenig begins hearing a female voice he doesn't recognize, but the voice gives him the precise coordinates of Carter's ship. Alan, still alive, hears the voice as well - and thinks he sees a veiled figure in the cockpit of his Eagle. But a new danger presents itself when a massive planet appears in the path of the moon - and this time, there's no getting around it or going through it. Bergman and Paul Morrow concoct a plan to recreate the cataclysmic blast that originally threw the moon out of Earth's orbit to divert its course, but Koenig continues to hear the mysterious voice, and this time it's telling him not to change the moon's course. The voice was right once before, so how far will Koenig trust it this time?
• Guest Cast: Margaret Leighton (Queen Arra), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter)
• Originally broadcast: 18 September 1975

War Games

• written by Christopher Penfold
• directed by Charles Crichton
• music by Barry Gray
  additional music by Vic Elms
• Story: As the moon swings close to a habitable planet, it is greeted by that world's warships - not the friendly greeting Koenig hoped for. Eagles are launched to intercept them, loaded for bear...and the attacking ships are destroyed far too easily for Alan Carter's tastes. Another attack wave is launched, and this time Moonbase Alpha takes heavy damage and suffers heavy casualties. Three additional Eagles are destroyed before they can even lift off, and now Alan Carter's fleet of three armed ships are the moon's only defense. One of them is taken out by the still-unknown assailants, and Koenig's crew scrambles to keep up with the damage on Moonbase Alpha. Carter succeeds in eliminating the new attack wave, but his own ship is disabled in the process...and another wave arrives, this time targeting Alpha's main mission control center and medical bay directly. Koenig orders the entire crew to move as deep underground as possible, and Carter musters just enough power from his Eagle to fend off the attackers. With a momentary reprieve in the action, Koenig and his team assess the damage - and there's no way Moonbase Alpha will survive without outside assistance. And the only nearby civilization lies on the planet from which the hostile ships have been launched...an unlikely candidate for humanitarian aid.
• Guest Cast: Anthony Valentine (Male alien), Isla Blair (Female alien), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter)
• Originally broadcast: 25 September 1975

Death's Other Dominion

• written by Anthony Terpiloff & Elizabeth Barrows
• directed by Charles Crichton
• music by Barry Gray
  additional music by Vic Elms
• Story: Passing close to the icy world of Ultima Thule, the moon receives a signal from a lost Earth expedition claiming to have created a paradise - one in which human beings can live forever. When Koenig, Dr. Russell, Alan Carter and Professor Bergman take an Eagle down to the surface, however, they find the most forbidding icy landscape imaginable - one in which they almost don't survive. The humans on Ultima Thule find them just in time, except for Carter, who stumbles back to the Eagle and manages to get back inside. Dr. Cabot Rowland and the seemingly insane Colonel Tanner lead two discrete factions of survivors from a failed mission to Uranus, but they're not exactly locked in a struggle for survival. Beneath the surface of Ultima Thule, coniditions are tolerable - and all indications are that the "Thulians" are indeed impervious to disease or old age. What's more, Rowland is eager for the Alphans to join them, promising the entire crew immortality of their own. Tanner, himself a former command office despite his disheveled appearance and behavior, takes Koenig into his confidence and reveals that the immortality promised by Rowland has come at a tragic price in wasted lives, and the process is by no means guaranteed to succeed. But even with this information, will Koenig's crew opt for eternal life on Ultima Thule, or their uncertain existence on Moonbase Alpha?
• Guest Cast: Brian Blessed (Dr. Cabot Rowland), John Shrapnel (Colonel Jack Tanner), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Mary Miller (Freda)
• Originally broadcast: 2 October 1975

Voyager's Return

• written by Johnny Byrne
• directed by Bob Kellett
• music by Barry Gray
  additional music by Vic Elms
• Story: Two Eagles are sent to intercept an unknown artificial object on a direct course for the moon. The object emits an unusual energy which cripples both Eagles. Alan Carter is able to pull his ship away and return to Moonbase Alpha, while the second Eagle is destroyed. Then a remarkable signal is received: the object is none other than the Earth-launched Voyager 1 unmanned probe. Powered by the Queller atomic drive, Voyager 1 overpowers everything that comes in close contact with it - leaving Koenig with mere hours before the probe destroys Moonbase Alpha. Bergman is unable to find any way to shut down the Queller drive from a distance. But Koenig is stunned when an Alpha scientist, Dr. Linden, comes forward and quietly admits that he is actually Queller, the inventor of the overpowered drive. Queller thinks he can find the means to shut down Voyager 1's engine without destroying the probe or its wealth of information gathered in deep space. But some members of Alpha's crew, including Paul Morrow, would have a grudge to settle with Queller is Koenig released the man's identity: Queller's Voyager 2 probe exploded after liftoff, killing many innocent civilians, including Morrow's father and the parents of "Linden"'s own lab assistant. Even if Queller can figure out how to disable his nuclear engine, will he live to put his idea into practice when his assistant learns his identity?
• Guest Cast: Jeremy Kemp (Dr. Linden), Barry Stokes (Jim Haynes), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Alex Scott (Aarchon), Lawrence Trimble (Pilot Abrams)
• Notes: This episode features a Voyager 1 unmanned probe, but it's not the real thing. This episode's Voyager 1 probe is a bulky craft (resembling, more than anything, the Viking Mars-landing probes of the 1970s) launched in 1985, powered by atomic engines. The real Voyager 1 (seen at right) was launched in 1977 alongside its sister ship, Voyager 2. It had small maneuvering engines, but it did, in fact, draw its operating power from three radioisotope thermonuclear generators which passively generated power from the decay of radioactive material (since the Voyager probes' distance from the sun makes solar power generation impractical). So, while the shape and specifics of Space: 1999's Voyager probes are off, this episode anticipated the NASA/JPL Voyager probes with a fair degree of accuracy. (It's also worth noting, however, that the Voyager probes had been in planning since the late 1960s.) This episode is also notable for featuring Jeremy Kemp, who played Captain Picard's brother Robert in Star Trek: The Next Generation.
• Originally broadcast: 9 October 1975

Alpha Child

• written by Christopher Penfold
• directed by Ray Austin
• music by Barry Gray
  additional music by Vic Elms
• Story: The first child since the moon left Earth's orbit is born, and Dr. Russell happily reports that the delivery took place with no complications. But within an hour of the birth, something remarkable and inexplicable happens: the child seems to age several years in the blink of an eye. All of his motor skills suddenly seem to be on a par with those of a five-year-old, until Dr. Russell discovers he's deaf and mute - sparking fears that the radiation and other effects experienced by the moon since it left the solar system may mean that normal childbirth isn't possible on Moonbase Alpha. Despite this, Koenig and the entire crew take great delight in helping to raise little Jackie (named after his late father, a deceased crew member), and Bergman discovers that the boy has an aptitude for artwork ...and perhaps more than just artwork, as he sketches a detailed drawing of an enormous spacecraft just as that very ship approaches Moonbase Alpha.
• Guest Cast: Julian Glover (Jarak), Cyd Hayman (Sue Crawford), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Wayne Brooks (Jackie)
• Originally broadcast: 16 October 1975

Dragon's Domain

• written by Christopher Penfold
• directed by Charles Crichton
• music by Barry Gray
  additional music by Vic Elms
• Story: Tony Cellini, a member of the Moonbase Alpha crew, suffers from recurring visions that he is under attack. But on this occasion, he finds an axe imbedded in one of the walls of his quarters, convincing him that the attack was real. Cellini is soon detected breaking into one of the Eagle launch pads, and when Carter tries to stop him from stealing an Eagle, Cellini attacks him. Koenig has to stun Cellini to stop the hijack attempt, and Dr. Russell criticizes Cellini's very presence on Moonbase Alpha. Prior to taking command of the moonbase, Koenig and Cellini were fellow astronauts competing for command of the Ultra Probe, which was the furthest-ranging manned mission of its day. Cellini won the captain's seat on that mission, but returned over a year later having lost his crew to what he says was a hideous alien creature that boarded the probe - but the black box recorder never confirmed his story, and Cellini was cast aside, saved from discharge by Koenig's insistence alone. But now Cellini says that the creature that attacked the Ultra Probe and killed his crew is still pursuing him - and when a graveyard of spacecraft is detected, including the jettisoned service module of the Ultra Probe (light years from where that module was actually left behind), it seems like Cellini's discounted monster story may be terrifyingly real.
• Guest Cast: Gianni Garko (Tony Cellini), Douglas Wilmer (Commissioner Dixon), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Barbara Kellerman (Dr. Monique Bouchere), Michael Sheard (Dr. Darwin King), Susan Jameson (Professor Juliet Mackie)
• Note: This is the first instance of Helena Russell doing a log entry in the series; it would become a staple feature of the second season. As of this episode, the Moon left Earth's orbit 877 days ago.
• Originally broadcast: 23 October 1975

Mission Of The Darians

• written by Johnny Byrne
• directed by Ray Austin
• music by Barry Gray
  additional music by Vic Elms
• Story: An advanced spacecraft identifying itself as the Daria drifts close to the Moon, sending out a distress signal requesting medical and technical help. Commander Koenig leads a rescue mission to the Daria, but when the Eagle from Moonbase Alpha is in close proximity to the Daria, the smaller ship's systems are overpowered and it is drawn inside and docked to the Daria. As the Alpha crew explore the devastated interior of the ship, they encounter several dwarf-like beings, but Koenig and Bergman are overcome by taller, spacesuited guards. And yet a third group seems to make itself frighteningly apparent when a large, burly man attacks the guard accompanying Dr. Russell. When Koenig regains consciousness after being stunned, a woman named Kara explains that the city-ship has been overrun by primitives. Dr. Russell witnesses the primitives' society first-hand when she is forced to watch as first one of the dwarves, and then her own security guard, are executed for being declared mutants by one of the larger beings. Her relief is short-lived when she learns that the primitives have been seeking a perfect victim for sacrifice to their god, Neman. Neman is also the name of Daria's captain, who proposes an alliance with Koenig. Daria is a generational ship, launched hundreds of years ago, which is now closing in on its destination - a world that the Alphans could share with the Darians. But are the humans, whether from Moonbase Alpha or from the lower decks of Daria itself, being invited to be the Darians' neighbors...or their food source?
• Guest Cast: Joan Collins (Kara), Dennis Burgess (Neman), Aubrey Morris (Darian), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Nick Tate (Alan Carter), Paul Antrim (Lowry), Robert Russell (Hadin), Gerald Stadden (Male Mute), Jackie Horton (Female Mute)
• Originally broadcast: 30 October 1975

Black Sun

• written by David Weir
• directed by Lee H. Katzin
• music by Barry Gray
  additional music by Vic Elms
• Story: A large but harmless asteroid is detected, but its course won't even bring it close to the moon - until it suddenly changes direction and heads straight for the moon, coming close enough to extert tidal gravity on Moonbase Alpha itself before diverting again and exploding. The cause of the unusual gravity influence is discovered: a black hole close enough to divert even the moon from its path. With only three days left until the moon is swallowed, Professor Bergman devises a force field that could theoretically repel the immense gravitational stresses...but as a backup plan, Koenig has one Eagle stocked up with supplies and ready to ferry six people to safety as a lifeboat. And as the moon draws closer to the black hole, it begins to look as though the lifeboat plan offers the only chance of survival for anyone.
• Guest Cast: Paul Jones (Mike Ryan), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Jon Laurimore (Smitty)
• Originally broadcast: 6 November 1975

Guardian Of Piri

• writer not credited
• directed by Charles Crichton
• music by Barry Gray
  additional music by Vic Elms
• Story: The moon nears a colorful planet, but Moonbase Alpha's scanners can't indicate whether or not the planet sustains life. An Eagle is dispatched to investigate, and the two pilots aboard make a remarkable find - a "forest" of spherical shapes. When they begin flying recklessly among the spheres, exhibitng almost intoxicated behavior, Carter furiously orders the pilots to return to the moon - and then contact is lost. Carter blames the incident - and presumably the death of two pilots - on a rapid-fire series of computer failures on Moonbase Alpha. As the head of the moonbase's computer division, Kano is at a loss to explain, and the failures continue: a patient dies during a routine (but computer-supervised) blood transfusion, and computer-maintained life support drops the oxygen level within the moonbase (causing Bergman's artificial heart to fail momentarily). A second excursion, in an Eagle with no computer control, reveals that the first Eagle didn't crash - it's suspended in mid-air above the planet's surface. To find the source of the computer glitches, Kano interfaces himself with the moonbase's mainframe via an implanted connection, but he vanishes before Dr. Russell's eyes. Koenig and Alan Carter visit the planet for themselves, where Koenig finds Kano and the missing pilots. They can't tell him what's happened - until a beautiful woman appears, offering Koenig and the other humans eternal happiness. All they need to do is pledge their loyalty to the Guardian of the planet Piri. Koenig refuses, and when he returns to the Eagle, finds that Alan has received a visit from the woman as well - and he seems to have accepted her offer. It also seems that the rest of Koenig's crew has accepted the invitation from Piri, as he discovers when he returns.
• Guest Cast: Catherine Schell (The Woman), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Michael Culver (Pete Irving)
• Notes: Technically, Christopher Penfold is credited only as the story consultant, and no writer is actually credited for this episode. However, it's worth noting that Kano's human-computer interface is very similar conceptually - right down to the plug-in jack implanted into the back of his head - to Crewman Maddox's computer connection in the 1984 Doctor Who story Warriors Of The Deep, which was written by Space: 1999 veteran Johnny Byrne. Actress Catherine Schell would join the show's regular cast in season two, although in a very different role.
• Originally broadcast: 13 November 1975

End Of Eternity

• written by Johnny Byrne
• directed by Ray Austin
• music by Barry Gray
  additional music by Vic Elms
• Story: The moon passes an asteroid which shows signs of something unusual beneath its surface. Using explosive charges, an expedition led by Koenig and Professor Bergman unearths a door of artificial origins. An attempt to open a door further inside the underground installation results in a huge explosion, and while the second door opens, someone who was standing behind it is critically injured. Koenig and his landing party return the humanoid to Moonbase Alpha, where he dies on the operating table. And yet, when Dr. Russell prepares to conduct an autopsy, she finds that the humanoid is unharmed - in fact, his body is regenerating. Before long, the fully-restored alien visitor is on his own two feet again, exploring the Moonbase, despite security's best efforts to restrain him. Though he expresses his gratitude to Koenig for freeing him from the asteroid, the entity known as Balor soon all but takes over Moonbase Alpha in a display of power and pure evil.
• Guest Cast: Peter Bowles (Balor), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Jim Smilie (Baxter)
• Originally broadcast: 20 November 1975

A Matter Of Life And Death

• written by Art Wallace & Johnny Byrne
• directed by Charles Crichton
• music by Barry Gray
  additional music by Vic Elms
• Story: An Eagle is launched to reconnoiter a promising planet which the Moonbase Alpha crew has dubbed "Terra Nova" - new Earth. The two men aboard the ship return with good news - they've found a planet with an Earthlike atmosphere and almost unlimited resources - but just as they make their final approach back to the moon, an electrical discharge envelops the Eagle, incapacitating the crew. The ship is still brought in for a safe landing, with the crew alive but unconscious - and carrying an extra passenger who Dr. Russell says is her husband, missing and presumed dead after his last space mission ended in disaster five years ago. Though he is breathing and seems to be alive, none of the medical instruments indicate life signs. Commander Koenig decides to postpone any further visits to Terra Nova, let alone any colonization operations, until the mystery of Russell's husband. When the long-lost astronaut awakens, Helena tells him of Koenig's plans to colonize Terra Nova - and then he lashes out at her with the same energy that almost brought the Eagle down.
• Guest Cast: Richard Johnson (Lee Russell), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Stuart Damon (Parks)
• Originally broadcast: 27 November 1975

Earthbound

• written by Anthony Terpiloff
• directed by Charles Crichton
• music by Barry Gray
  additional music by Vic Elms
• Story: As Commissioner Symonds, stranded on Moonbase Alpha since the moon was thrown free of Earth's orbit, chides Commander Koenig for not trying to find a way to reverse the moon's course, an small alien spacecraft is detected hurtling toward the moon. The ship crash-lands, and Koenig leads an expedition to see if there are any survivors. What his team finds is a number of humanoids in suspended animation, though the first attempt to revive one of them proves disastrous - and an automatic security system awakens the others, who naturally want to know why one of their crew is dead. Koenig manages to convince the aliens to move their vehicle to Moonbase Alpha for repairs, but is annoyed when Symonds tries to pull rank upon meeting the alien visitors. As it happens, Captain Zantor and his crew happened to be mounting a peaceful exploration of Earth, and Helena's examination reveals Zantor's people to be perfectly compatible with humanity. Forgiving the death of his crew member, Zantor even offers the vacant stasis chamber to one member of Koenig's crew, and Symonds jumps at the chance to go back to Earth, even though it's a 75-year trip. Helena insists on testing the aliens' equipment to ensure suitability for a human passenger, but she is put into a deeper state of suspended animation by accident - and with the open seat to Earth now filled by accident, Symonds wants to take Zantor's entire ship by force.
• Guest Cast: Roy Dotrice (Commissioner Symonds), Christopher Lee (Captain Zantor), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter)
• Notes: Some of the background atmosphere sounds heard as Koenig's crew enters the alien spacecraft are well-known to viewers of other British SF staples - namely as part of the background sound loop of many a Dalek control center in Doctor Who.
• Originally broadcast: 4 December 1975

The Full Circle

• written by Jesse Lasky Jr. & Pat Silver
• directed by Bob Kellett
• music by Barry Gray
  additional music by Vic Elms
• Story: Eagle 6 is launched to explore an Earthlike planet, but when the landing party doesn't report back to Moonbase Alpha for hours, Koenig orders the ship returned by remote control...but Eagle 6 returns with no one aboard except for a dead caveman. A full-scale rescue operation is launched, with only three days to find the missing Eagle crew before the moon moves out of range. The rescue mission goes disastrously wrong, though - Commander Koenig and Dr. Russell go missing, along with the rest of their Eagle's search party, while Carter is attacked by more cavemen when he lands a second Eagle and begins his own search for Koenig. Carter narrowly escapes being killed when the cavemen are too fascinated by his communicatior to deliver the fatal blow. Back at the Moonbase, the autopsy of the caveman turns up something very disturbing: he was originally a member of the first Eagle crew.
• Guest Cast: Prentis Hancock (Paul Morrow), Clifton jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Oliver Cotton (Spear man)
• Originally broadcast: 11 December 1975

Another Time, Another Place

• written by Johnny Byrne
• directed by David Tomblin
• music by Barry Gray
  additional music by Vic Elms
• Story: A cloud of dust and brilliant lights draws the moon into its center and then keeps moving past it. Moonbase Alpha sustains moderate damage, but it also seems to have been thrown far from where its normal wanderings would have taken it. One member of the grew, Regina Kesslann, hasn't quite recovered from the collision with the dust cloud, insisting that she saw the moon vanishing into the distance - from inside the Moonbase. She also seems to think that Commander Koenig and Alan Carter died during the incident. As the moon approaches a solar system, instruments seem to indicate that the star is Earth's sun - and that the third planet orbiting that star is Earth itself. Koenig grows skeptical as the moon slips into its old orbit without incident, though the rest of the crew is eager to return home without asking too many questions. The one person who continues to have difficulty is Regina, and Dr. Russell is at a loss to explain her condition. When Professor Bergman does a closer inspection, he discovers something even more disturbing: the Earth is now a radioactive wasteland, incapable of supporting human life.
• Guest Cast: Judy Geeson (Regina Kesslann), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter)
• Notes: Judy Geeson later appeared in early seasons of Star Trek: Voyager as Sandrine, the proprietor of Tom Paris' holodeck pool hall.
• Originally broadcast: 18 December 1975

The Last Sunset

• written by Christopher Penfold
• directed by Charles Crichton
• music by Barry Gray
  additional music by Vic Elms
• Story: The moon swings through a solar system containing the Earthlike world of Ariel, but just as the first expedition is launched to visit the planet, an unmanned probe meets Alan Carter's Eagle halfway there. Fearing it may be a bomb, Koenig orders the mission aborted and has the Eagle brought back to Moonbase Alpha by remote control. The device doesn't explode, but instead begins spewing out gas. More probes, all identical, touch down on the lunar surface and follow suit, and Koenig fears an invasion. Bergman discovers that the massive amounts of gas delivered by the probes are breathable air, giving the moon a summery, Earthlike atmosphere. If the moon gets close enough to Ariel's sun to take up an orbit, this new paradise will permanently rid the Alphans of their need to colonize another world. But if the moon slips through Ariel's system, the atmosphere will dissipate again...and if that happens while members of the crew are still outside exploring their newly terraformed home, it'll mean certain death for them.
• Guest Cast: Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter)
• Originally broadcast: 1 January 1976

The Troubled Spirit

• written by Johnny Byrne
• directed by Ray Austin
• music by Barry Gray
  additional music by Vic Elms
• Story: While most of the crew enjoys a musical recital, something sinister is taking root in Moonbase Alpha's agricultural area. An experiment in trying to communicate on a psychic level with plant life has disastrous effects for Dan Mateo, one of the experimenters. A strange creature is spotted stalking Alpha's corridors, accompanied by an almost supernatural display of wind and sound - and Dr. Russell thinks it's Mateo himself in some other form. When the apparition begins killing off members of the crew, starting with the other plant-contact researchers, dealing with it becomes of prime importance (even though Alan Carter and other members of the crew don't even believe the creature exists). But can the intruder be eliminated without killing Mateo, with whom it seems to share a psychic link?
• Guest Cast: Giancarlo Prete (Dan Mateo), Hilary Dwyer (Laura Adams), Anthony Nicholls (Dr. James Warren), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter)
• Originally broadcast: 5 January 1976

The Infernal Machine

• written by Anthony Terpiloff and Elizabeth Barrows
• directed by David Tomblin
• music by Barry Gray
  additional music by Vic Elms
• Story: While Paul Morrow is sidelined by an injury, Commander Koenig installs another crewman in the first officer's chair - and is a little irritated when Winters calls him not long after Koenig goes off-duty. But it turns out the junior officer has a good reason to call Koenig - a large spacecraft approaches the moon and begins influencing Moonbase Alpha's computer. A booming voice virtually invites itself to Alpha, despite the misgivings of Koenig and Alan Carter, and demands that Koenig, Dr. Russell and Professor Bergman pay it a visit. When the trio arrives at the gigantic ship, they see an ornate interior, advanced technology, and absolutely no sign of life until the happen upon a bearded old man who introduces himself only as Companion. Before Koenig can find out why the vessel has landed on the moon, another voice rings out, demanding supplies from Alpha - enough supplies to leave the human population of the base in jeopardy. Companion points out that the voice is that of Gwent, the spacecraft itself, a sentient machine. But when even Companion balks at Gwent's demands, Gwent decides that one of its visitors should become its next spokesperson.
• Guest Cast: Leo McKern (The Companion), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Nick Tate (Alan Carter), Gary Waldhorn (Winters)
• Notes: The late Leo McKern was the only actor to appear twice in the role of Number Two in The Prisoner - a show of which director David Tomblin is also an alumnus. This is also the only first season episode not to feature Prentis Hancock as Paul Morrow.
• Originally broadcast: 8 January 1976

Ring Around The Moon

• written by Edward di Lorenzo
• directed by Ray Austin
• music by Barry Gray
  additional music by Vic Elms
• Story: A glowing red orb appears near the moon, and the first Alpha crewman who sees it, Ted Clifford, goes berzerk, transmitting sensitive information to the orb, attacking anyone who attempts to stop him, and ultimately begging for help just before he falls over dead. The orb envelops the moon with a glowing light while still moving closer. The mysterious object then transmits a warning to Moonbase Alpha: everyone there is a prisoner of the planet Triton. When Koenig dispatches Carter to inspect the orb up close in an Eagle, the object disables the ship's crew and sends the Eagle tumbling back to the moon, out of control. A rescue party goes to retrieve the ship and Carter, the only survivor, but the orb descends again, extending its influence to Helena and attacking Koenig when he attempts to free her. By the time Koenig comes around, Helena has vanished. Koenig insists on making a return visit to the orb to free Helena, and Carter - disturbed that he alone survived the previous Eagle's flight - insists on going with him. But Koenig has an ace up his sleeve: Bergman has devised a force field allowing them to get closer. Though they make their way past the probe's initial attack, it still incapacitates the Eagle's pilots and sends them back to the moon (though a carefully preprogrammed autopilot prevents another crash landing). This time, however, the Orb returns to the moon, depositing Helena at Alpha. But is she under her own control...or is she doing the bidding of Triton?
• Guest Cast: Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Max Faulkner (Ted Clifford)
• Originally broadcast: 15 January 1976

Missing Link

• written by Edward di Lorenzo
• directed by Ray Austin
• music by Barry Gray
  additional music by Vic Elms
• Story: Koenig, Bergman, Alan Carter and Sandra Benes return from an aborted planetary excursion. Right after they report an unusual gravity phenomenon that almost caused their Eagle to crash on the planet, a similar force grips the Eagle and forces it down into a crash landing on the moon itself. But on Moonbase Alpha, medical scanners indicate that Commander Koenig didn't survive the crash. And yet he's alive and well, suited up and trying to wave the rescue Eagle down to the crash site - or is he? When Carter comes to, he sees the commander slumped over the controls, badly injured. But in his mind, Koenig has returned to Moonbase Alpha, though it's darkened and seemingly abandoned. He makes his way to the main mission control center, activates the viewscreen...and sees an alien city. The environs of the moonbase melt away around Koenig, and he finds himself in an empty space with a humanoid being who introduces himself as Raan. Koenig is to be studied and subjected to experiments, as Raan believes that humans may be the missing evolutionary link in his own species. And yet, Koenig's body is still in a comatose state, returned to the very-much-populated Moonbase Alpha. When Koenig is subjected to an elaborate illusion in which Bergman acts uncharacteristically emotional, he realizes that Raan is holding his mind captive - and doesn't intend to release it.
• Guest Cast: Peter Cushing (Raan), Joanna Durham (Vana), Paul Morrow (Prentis Hancock), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter)
• Originally broadcast: 22 January 1976

Space Brain

• written by Christopher Penfold
• directed by Charles Crichton
• music by Barry Gray
  additional music by Gustav Holst
• Story: A signal from deep space gives Moonbase Alpha's crew a much-needed bit of excitement after a long dry spell. An Eagle is dispatched to find the source of the transmission, but it is destroyed as it draws close to the object. When Alan Carter takes an Eagle with a rescue module to retrieve the previous Eagle's crew - or their remains - an object passes his ship at high speed, eventually colliding with the moon. When Professor Bergman examines the object, he discovers it's composed of various minerals - and a trace of human tissue. Carter's copilot, Kelly, undergoes an unusual transformation while performing a spacewalk to retrieve one of the other Eagle pilots. Moonbase Alpha continues receiving an indecipherable signal, though Kelly could be the key to interpreting it...but the only way for Koenig to find out is to attempt a risky mental link with Kelly and whatever has taken over the pilot's mind.
• Guest Cast: Shane Rimmer (Kelly), Carla Romanelli (Melita), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter), Derek Anders (Wayland)
• Originally broadcast: 29 January 1976

The Testament Of Arkadia

• written by Johnny Byrne
• directed by David Tomblin
• music by Barry Gray
  additional music by Vic Elms
• Story: The Moon's course alters itself as it passes by the lone Earthlike planet of an isolated star. But the planet isn't big enough to be having a gravitational effect on the passing Moon, and then the impossible happens - the Moon is drawn into an orbit near the planet and then stops dead in its tracks. A spreading power loss means that Moonbase Alpha may be uninhabitable within two days, so Koenig leads an expedition to see if something on the planet is holding the Moon still. But the planet Arkadia holds startling discoveries - a cave full of human skeletons, and a wall-sized inscription in what appears to be Sanskrit. As Alpha's power supply, heat and life support continue bleeding away, Koenig has to consider the possibility of evacuating his crew to a world sterilized by an unknown disaster. But when the message found on the planet is decoded, it raises a mind-boggling question: will the Alphans be returning to humanity's ancestral home if they settle on Arkadia?
• Guest Cast: Orso Maria Guerrini (Luke Ferro), Liza Harrow (Anna Davis), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Anton Phillips (Dr. Mathias), Nick Tate (Alan Carter)
• Originally broadcast: 12 February 1976

The Last Enemy

• written by Bob Kellett
• directed by Bob Kellett
• music by Barry Gray
  additional music by Vic Elms
• Story: The moon approaches a star with two life-supporting planets in identical and opposing orbits, neither world ever seeing the other directly. Unexpectedly, a battleship from one of those planets approaches the moon, and Koenig puts Moonbase Alpha on red alert, assuming that the massive vessel's intent is hostile. But it seems the aliens already have the upper hand - none of the battle-ready Eagles can lift off from the moon. The main computer also shows signs of being influenced from an outside force, and then Alpha's defense screens and communications fail. Moonbase Alpha is powerless to prevent the battleship from landing and launching missiles - but the base isn't the target. The aliens are using the moon to launch a vicious attack on the other planet, a target their missiles would normally never reach thanks to the star's gravity. A counterstrike targets the moon - and before a signal can be sent to either of the warring planets, Moonbase Alpha is a target for both sides in a bitter, centuries-old war to the death.
• Guest Cast: Caroline Mortimer (Dione), Prentis Hancock (Paul Morrow), Clifton Jones (David Kano), Zienia Merton (Sandra Benes), Nick Tate (Alan Carter), Maxine Audley (Theia), Kevin Stoney (Talos), Carolyn Courage (First girl)
• Notes: It wasn't originally intended to be last, but this episode wound up closing the first season on its first UK broadcast. It was the 18th episode produced.
• Originally broadcast: 19 February 1976