The 79th episode of The Adventures Of Superman airs in syndication, starring George Reeves, Noel Neill, and Jack Larson. This is the fifth season premiere.
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ABC airs the 47th episode of the supernatural anthology series One Step Beyond, hosted and directed by John Newland. Ronald Howard guest stars.
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The 26th episode of Irwin Allen’s adventure series Voyage To The Bottom Of The Sea airs on ABC, starring Richard Basehart and David Hedison. Skip Homeier guest stars.
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British broadcaster ABC airs the 102nd episode of the spy-fi series The Avengers, starring Patrick Macnee and Diana Rigg.
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The 53rd episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris.
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The 53rd episode of Gene Roddenberry’s science fiction series Star Trek premieres on NBC. In true sixties style, the story’s “ultimate computer” is depicted as a giant mainframe with psychedelic lights; William Marshall guest stars. 
The 238th episode of Doctor Who airs on the BBC. This is the second story written by Robert Holmes, and is the most recent Doctor Who story to be missing entire episodes from the BBC’s archives.
ABC airs the 50th episode of Irwin Allen’s sci-fi series Land Of The Giants, starring Gary Conway, Don Matheson, Deanna Lund, and Don Marshall. Bruce Dern (Silent Running) and Yvonne Craig (Batman, Star Trek) guest star.
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The 25th episode of Gerry Anderson’s live-action UFO series airs on ITV, starring Edward Bishop and Michael Billington. Jane Merrow and Patrick Jordan guest star in the curiously long-delayed continuation of the series.
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The seventh episode of The Six Million Dollar Man is broadcast on ABC, starring Lee Majors and Richard Anderson. Gary Lockwood (The Lieutenant, 2001: a space odyssey) and William Schallert guest star.
The 392nd episode of Doctor Who airs on BBC1. This episode marks the first-ever appearance of Davros in the series, as well as the first attempt to nail down an origin story for the Daleks themselves.
Marvel Comics begins shipping the first issue of its six-issue adaptation of George Lucas’ upcoming film Star Wars, with Lucas reaping the rewards of the licensing arrangement directly since 20th Century Fox has allowed him to keep all merchandising rights to the yet-to-premiere movie. Adapted from the screenplay and edited by Roy Thomas, with artwork by Howard Chaykin, lettering by Jim Novak and colors by Marie Severin, the first six issues offer an interesting visual take on a universe whose visuals were not finished enough for the artist to view ahead of time. After the six issue movie tie-in, Thomas and Chaykin would begin concocting the budding franchise’s first-ever non-film storylines. 
With the BBC giving his creation a late-night time slot indicating that they don’t really know what to do with it, Douglas Adams bursts onto the scene with the premiere of his radio series The Hitchhiker’s Guide To The Galaxy. Another attempt at mixing comedy and science fiction, Adams’ densely-worded style of wit catches on with an audience that’s never heard anything like it before. Hitchhiker’s Guide goes on to conquer nearly every medium exposed to it in the years to come.
Space Shuttle Columbia is officially rolled out of the Rockwell International construction facility in Palmdale, California, even though her outer “skin” is still unfinished – NASA technicians continue working on perfecting the first spaceworthy shuttle’s thermal tiles for much of the next year, delaying the first launch until sometime in 1981 (just another in a series of delays for a vehicle that had been intended to fly as early as 1977).
Following five years of research and development, Netherlands-based Philips Electronics demonstrates one of the earliest iterations of the compact audio disc, an optical disc in the now-familiar five-inch size which can be read by a CD player with a laser diode. Philips and Sony, who have been developing the new medium in parallel, will later join forces and create a standard for audio compact discs in 1980, introducing the CD as a consumer product in the early 1980s despite resistance from record companies with a vested interest in vinyl LPs (and only a begrudging acceptance of audio cassettes). In addition to higher audio fidelity and a more durable medium (an optical disc encased in a plastic shell, protecting the physical surface that is so often damaged with vinyl), the CD and its player can also compensate for any damage suffered by the disc through error correction.
ITV airs the 11th episode of Roald Dahl’s anthology series Tales Of The Unexpected, hosted by the author himself and adapted from his short stories. Derek Jacobi guest stars.
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Emerson, an American radio and telvision manufacturer that has shown no previous interest in the video game boom, releases its own console, the Emerson Arcadia 2001. Intended to be a serious challenger to the Atari VCS and Intellivision, the Arcadia 2001 has limited graphics capabilities and a limited library boasting relatively generic sports games and knock-offs of popular arcade games, as well as a few incredibly obscure licensed arcade ports.
The 572nd episode of Doctor Who airs on BBC1. What most fans don’t realize, thanks to a carefully coordinated reveal, is that Earthshock is the first Cyberman story since 1975’s Revenge Of The Cybermen. The Cybermen are only seen at the end of part one, and producer John Nathan-Turner declines the potentially valuable offer of a Radio Times magazine front cover in order to preserve the surprise.
The 598th episode of Doctor Who airs on BBC1. Valentine Dyall appears as the Black Guardian with Cyril Luckham reprising the role of the White Guardian. This concludes the 20th season’s “Guardian/redemption of Turlough” trilogy.
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The 621st episode of Doctor Who airs on BBC1. Robert Glenister (Life On Mars), Maurice Roeves (The Nightmare Man) and Christopher Gable guest star. This four-part story is the swan song of the fifth Doctor (Peter Davison).
The tenth episode of a modern reboot of Dan Curtis’ gothic horror series Dark Shadows is broadcast on NBC, starring Ben Cross, Lysette Anthony, Roy Thinnes (The Invaders), and Jean Simmons.
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The week-long national syndication window opens for the ninth episode of Star Trek: Deep Space Nine. Joel Brooks guest stars. Allamaraine!
The 15th episode of Roger Price’s rebooted science fiction series The Tomorrow People is broadcast on ITV in the U.K. (and will appear later on Nickelodeon in North America), starring Kristian Schmid, Naomie Harris (Spyfall), and Christian Tessier. Christopher Benjamin (Doctor Who) and Mac McDonald (Red Dwarf) guest star in the second season finale.
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The 25th and final episode of Roger Price’s rebooted science fiction series The Tomorrow People is broadcast on ITV in the U.K. (and will appear later on Nickelodeon in North America), starring Kristian Schmid, Alexandra Milman, and Christian Tessier. Clive Merrison and Danny John-Jules (Red Dwarf) guest star. After this series, The Tomorrow People will be revived in the 21st century for an American audience, as well as a series of Big Finish audios continuing the adventures of the 1970s series’ cast of characters.
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Fox airs the 11th episode of Tracy Torme’s alternate-universe science fiction series Sliders, starring Jerry O’Connell, John Rhys Davies, Sabrina Lloyd, and Cleavant Derricks. Gwynyth Walsh (Star Trek: The Next Generation) guest stars.
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The 67th episode of Chris Carter’s modern-day science fiction series The X-Files airs on Fox, starring Gillian Anderson and David Duchovny. Vic Trevino guest stars.
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The second episode of the time-travel/crime series Crime Traveller is broadcast on BBC1, created and written by Anthony Horowitz (Foyle’s War), starring Michael French (Casualty) and Chloe Annett (Red Dwarf). Mary Tamm (Doctor Who) guest stars.
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The 111th episode of Chris Carter’s modern-day science fiction series The X-Files airs on Fox, starring Gillian Anderson and David Duchovny. Veronica Cartwright (Alien) guest stars.
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UPN airs the 138th episode of Star Trek: Voyager. Mark Sheppard (Battlestar Galactica, Doctor Who, 24, Supernatural, Firefly) guest stars.
Space Shuttle Discovery lifts off on the 103rd shuttle flight, a mission to exchange crewmembers aboard the International Space Station. In the cargo bay is a logistics module containing consumables, supplies, and equipment racks to be installed in the Destiny laboratory module. Aboard Discovery for her 29th flight are Commander James Wetherbee, Pilot James Kelly, mission specialists Andrew Thomas and Paul Richards, and ISS Expedition 2 crewmembers James Voss, Susan Helms and Yuriy Usachev. The Expedition 1 crewmembers (William Shepherd, Yuri Gidzenko and Sergei Krikalev) return to Earth aboard the shuttle.