Terminus

Terminus is the fourth serial of the 20th season of the British science fiction television series Doctor Who, which was originally broadcast in four twice-weekly parts on BBC1 from 15 to 23 February 1983. In the serial, the alien time traveller the Fifth Doctor (Peter Davison) attempts to stop the fuel from a plague spaceship called Terminus from exploding and causing the destruction of the universe. Terminus is the second of three loosely connected serials where the Black Guardian (Valentine Dyall) attempts to compel the alien Vislor Turlough (Mark Strickson) to kill the Doctor. It marks the final regular appearance of Sarah Sutton as companion Nyssa. Plot Under the Black Guardian's instructions, Turlough sabotages the TARDIS, causing parts of it to dissolve. As the field of instability threatens to engulf Nyssa's room, a door appears behind her and the Fifth Doctor tells her to go through it. The TARDIS, to save itself, has materialised aboard a spaceship heading for an unknown destination. The Doctor and Nyssa, while exploring the ship, encounter two raiders, Kari and Olvir, who are intent on plundering the ship's cargo.