The people of Skonnos have been promised that their empire will be restored provided that they supply the alien Nimon with young sacrifices and radioactive hymetusite crystals. The Skonnons have been obtaining these from the nearby planet of Aneth.
The TARDIS has been stopped in space for repairs and encounters a Skonnon craft en route from Aneth, and Romana is taken aboard. The Doctor follows the craft in the semi-repaired TARDIS.
The people aboard the Skonnon craft are taken to the Nimons' lair, where the the Doctor and Romana discover that the Nimon are a parasitic race. An ambassador is sent to a planet and offers to help the natives. The hymetusite crystals are used to create a link through with the rest of the race can be transported.
The Doctor manages to destroy the link, and the Nimons are trapped on the last planet they visited - the dying Crinoth.
Regular castVoice of K-9: David Brierley; Romana: Lalla Ward;
Guest castSoldeed: Graham Crowden; Sorak: Michael Osbourne; Teka: Janet Ellis; Seth: Simon Gipps-Kent; Nimon: Robin Sherringham, Bob Appleby (4), Trevor St John Hacker (4); Co-Pilot: Malcolm Terris (1-3); Pilot: Bob Horney (1); Sezom: John Bailey (4);
Uncredited cast: Anethians: Nicholas Draek, Katy Jarret, Daniel Toabori. Rachel Wheeler; Anethian Corpses: (all 3) Gary Gold, Jane Foot, Debbi Thomson; Guards: (all 2-3) Paul Barton, Norman Bradley, David Glen, Terry Gurry, Joe Santo, Derek Suthern, Edmund Thomas; Skonnon Elders: (all 2-3) Robert Baker, Roy Brent, Derek Chafer, Jim Delaney, Eric French, Donald Groves, David Harris, Peter Jackson, Ray Lavender, Ronald Mayer, Roy Seeley, Trevor Wedlock;
|BBC 1||522||Part One||Sat 22 December 1979||6:10 pm - 6:35 pm||6.0M||100th|
|BBC 1||523||Part Two||Sat 29 December 1979||5:50 pm - 6:15 pm||8.8M||56th|
|BBC 1||524||Part Three||Sat 5 January 1980||6:20 pm - 6:45 pm||9.8M||40th|
|BBC 1||525||Part Four||Sat 12 January 1980||6:20 pm - 6:45 pm||10.4M||26th|
This programme does not have any outside filming
Television Centre Studio 3; Television Centre Studio 6;
Bloopers and mistakes
This programme has no bloopers or mistakes. It's probably not perfect, just that they haven't been found or pointed out yet.
Notes and trivia
The season should have closed with Shada, but a BBC strike resulted in it not being completed.
This programme has no other working titles, or they have not been yet been entered.