BBC1 premieres the 39th episode of Terry Nation’s science fiction series Blake’s 7, ending the third season and seeing out series regular Jan Chappell (Cally) and the Liberator. This is the last script written for the series by Terry Nation, as he has decided to try his fortunes as a writer and producer in Hollywood, and is intended to be the series finale. When broadcast on the BBC, a voice-over on the end credits informs viewers that Blake’s 7 will return in 1981 – something that even the cast and crew aren’t aware of until then. Gareth Thomas guest stars as Blake. 
Avon takes the Liberator on a wild goose chase to pursue a signal he has received from who he believes is probably Blake. He reaches the artificial planet Terminal and teleports down alone, telling the others he will kill anyone who follows, but Tarrant and Cally follow him anyway. He finds an underground complex where he is knocked out, drugged, and is taken to a lab where an image is implanted in his mind that he sees and speaks to an injured Blake who relies on his life support systems. Avon is then taken to Servalan, who soon captures Tarrant and Cally as well. Meanwhile, on the Liberator, due to a careless charge through a cloud of corrosive fluid en route to Terminal, the ship is falling apart: Zen “dies,” leaving just enough power to operate the teleport system. Servalan takes hostages, contacts the ship, and has Dayna teleported down. Servalan and her troops are taken aboard by Vila, who then is teleported down himself, saving Orac at the last moment as well. As Avon, Tarrant, Cally, Vila and Dayna watch from the control center inside Terminal, the Liberator leaves orbit with Servalan in control – and explodes in a massive fireball.
written by Terry Nation
directed by Mary Ridge
music by Dudley SimpsonCast: Paul Darrow (Avon), Jan Chappell (Cally), Michael Keating (Vila), Jacqueline Pearce (Servalan), Gareth Thomas (Blake), Steven Pacey (Tarrant), Josette Simon (Dayna), Peter Tuddenham (Zen), Gillian McCutcheon (Kostos), Heather Wright (Reeval), Richard Clifford (Toron), David Healy (Sphere Voice)
LogBook entry by Earl Green