by Chris Boucher
Blake and his crew plan to break the Federation's coded transmissions, but to do that they need a T.P. crystal. Avon and Vila visit Tynus, Commander of Fosforon and an old friend of Avon's, in an attempt to obtain a crystal from him. Meanwhile, aboard Liberator, Blake locates an ancient, drifting spacecraft, and Cally senses hostile life aboard. Tynus refuses to help Avon, believing that to do so will place him in jeopardy, forcing Avon to resort to blackmail to elicit his aid. But unknown to Avon and Vila, Tynus has already contacted the Federation, and informed them of the resistance fighters' presence at the station. When a Fosforon science team despatches a ship to investigate the ancient spacecraft, Blake contacts the team's leader, Doctor Bellfriar, with a warning. The scientific team discovers a decomposing corpse aboard the vessel, and brings it back to Fosforon. However, when a routine autopsy is begun, the corpse comes to life and strangles the pathologist; his team members come to his aid, but are too late to prevent his death. Later, those people that came into contact with the corpse contract a deadly virus, and die in agony. As the plague sweeps through the base, Blake and the others realise that it has been deliberately engineered by an alien race as a warning, and a way of keeping a limit on mankind's spread across the galaxy. As the plague spreads, Tynus pretends to help Avon to obtain the crystal from the communications centre, but Avon discovers his betrayal, and takes it himself. Tynus catches Avon in the act of stealing the crystal, and in the ensuing struggle Avon inadvertently pushes Tynus into high voltage equipment, electrocuting him. Avon and Vila return to the Liberator, where Avon, learning of the plague, urges Blake into letting Servalan arrive so that she will contract the disease. However, Blake's sense of responsibility leads him to launch a warning beacon around Fosforon.
Gareth Thomas (Roj Blake), Sally Knyvette (Jenna Stannis), Michael Keating (Vila Restal), Paul Darrow (Kerr Avon), Jan Chappell (Cally), Peter Tuddenham (Zen / Orac), Jacqueline Pearce (Servalan), Brian Croucher (Travis), Paul Daneman (Bellfriar), Colin Farrell (Gambril), Colin Higgins (Tak), Michael Gaunt (Bax), Ronald Lacey (Tynus), Morris Barry (Wiler)
Directed by Vere Lorrimer
Produced by David Maloney
20th February, 1979 @ 7.20 pm - 8.10 pm
*Featuring Roj Blake, Kerr Avon, Jenna Stannis, Vila Restal, Cally, Zen and Orac