Animals
Dayna visits a friend of her father’s, who she discovers is conducting needlessly painful experiments on some intelligent animals on that planet. Meanwhile, Scorpio is attacked after Dayna teleports, and it barely gets back to Xenon Base. When Avon and the others return to get Dayna, they find Servalan in control of the animals and of Dayna’s mind.
written by Allan Prior
directed by Mary Ridge
music by Dudley SimpsonCast: Paul Darrow (Avon), Jacqueline Pearce (Servalan), Michael Keating (Vila), Steven Pacey (Tarrant), Josette Simon (Dayna), Glynis Barber (Soolin), Peter Tuddenham (Orac, Slave), Peter Byrne (Justin), William Lindsay (Captain), Max Harvey (Borr), Kevin Stoney (Ardus), David Boyce (Og)
LogBook entry by Earl Green
Barber (Soolin), Peter Tuddenham (Orac, Slave), John Savident (Egrorian), Larry Noble (Pinder) 
Seven years after the massacre of his crewmates and the death of Blake on Gauda Prime, Kerr Avon comes out of seclusion to hear a proposition from an anti-Federation rebel named Lydon on a distant, unnamed world. Lydon has contacted Elise, Avon’s sometime-lover, to try to get Avon involved in an attempt to raid a shipment of Federation gold. Avon is skeptical of how Lydon hopes to help the resistance movement with what is essentially an interplanetary train robbery, and upon hearing Lydon’s plan he’s even more incredulous. But Avon still has an ace up his sleeve – he consults Orac to help him devise a more cohesive plan of action. Before any of those plans can be put into practice, Federation troops converge on Avon, Elise and the others, mounting a strike so precise that they must be getting information from Elise, her strong-arm cohort Kelso, or Lydon. Again, Avon comes to believe that the person he wanted to trust most has betrayed him, and he kills Elise. But this time, his actions and even his contingency plans have been anticipated by Federation psychostrategists, and Avon is captured and brought to Servalan, who has reclaimed her seat of power. But as part of her strategy to remain in power, Servalan has decided she needs enemies to keep the Federation distracted, and she intends for Avon to keep the resistance movement alive…even if it means that the man Avon is now will cease to exist. 
An unusually vivid nightmare gives Avon a horrifying preview of Servalan’s latest scheme. Using a jewel of alien origin, she can inflict her will upon others in a very limited fashion. A sudden escape from a Federation interceptor leaves Scorpio’s newly-installed stardrive drained. Since the stardrive’s advanced power cells can only be procured from a Federation installation, Avon decides to strike Servalan’s current hiding place, the planet Feron, where she is researching the origins and potential power of her new weapon. Avon and Vila eavesdrop in hiding as a scientist reveals the crystal’s secrets (and then condemns himself to a premature death by admitting that he knows that Servalan isn’t “Commissioner Sleer”). From that moment, the race is on to find a jeweled diadem whose telekinetic and telepathic properties would give its wearer more than enough power to topple the Federation. But when Avon learns that an even more powerful crown, of which the diadem is only a part, could give him the ability to rule the entire galaxy… why stop with just the Federation?
Avon hatches a risky plan to take over the planet Syndexia, the last remaining source of the hyperdrive fuel substance called Syndeton. But the already delicate plot is unraveled when Vila gets drunk in a bar on another planet and mentions Syndexia as the crew’s next destination. Vila is only barely rescued by the others as a Federation squadron moves in. Thanks to Vila’s carelessness, Servalan is alerted to Avon’s next destination, yet he presses on. Avon’s concern with Syndexia is not just with the coup to be gained by taking over the supply of Syndeton, either – in so doing, he intends to overthrow Madame Gaskia, Syndexia’s ruler, who once betrayed Avon to the Federation long before he joined Blake. Servalan is interested not only in the power to be harvested from Syndeton, but from its potential as a mind-controlling substance as well, an ability she tests by taking over Tarrant. Before long, the chase is on to find Dr. Rossum, a missing Federation scientist whose research into Syndeton could unlock its dangerous mind-control abilities. Scorpio’s crew finds Rossum first, but at the last minute, Avon insists on conceding this battle to Servalan – and the spoils could be control over every life form in the galaxy.
He created the role of a freedom fighter whose name graced a series that he didn’t even star in for half its run. Gareth Thomas, the man behind Blake of Blake’s 7 fame, talks about his most famous role, as well as presenting a few gems of his own creation.
A planet appears in the path of the TARDIS, moving so fast that a collision is unavoidable. Charley and C’rizz each awaken in a virtual reality of their past lives, but they each quickly figure out that the Kro’Ka is behind the illusions and are freed. When they awaken, they find not only the Kro’Ka, but Rassilon as well, who claims that he has nursed them back to health after the destruction of the TARDIS. But he shows them that the Doctor has survived as well, and he appears to have found company – a woman who has found him wandering through the jungle of the planet’s sole land mass. Charley and C’rizz both demand to be set free, but before he releases them Rassilon tries to put doubts in their minds about the Doctor – and each other. He’s at least partially successful, as the two TARDIS travelers go their own way in the jungle.