Written by Johnny Byrne
"Still safely hidden away in deep hibernation is the true life force of this planet. When restored, our civilisation will rule the Earth once more"
| Episode Title | Premiere Date |
| Episode 1 | 05/01/1984 |
| Episode 2 | 06/01/1984 |
| Episode 3 | 12/01/1984 |
| Episode 4 | 13/01/1984 |
Earth, 2084. Two global superpowers hover on the brink of war. When the TARDIS is forced to make an unplanned visit to Sea Base Four, the Doctor, Tegan and Turlough find themselves accused of being enemy agents. Quickly embroiled in a deadly game of paranoid intrigue, it becomes clear that others on the base have sabotage and murder in mind. However, there is a greater threat to humankind: the Silurians and Sea Devils, prehistoric reptiles seeking to reclaim the Earth. Can the Doctor prevent them from implementing their 'final solution' and triggering a war that could wipe out the entire human race?
Cast & Crew
The Doctor: Peter Davison
Tegan Jovanka: Janet Fielding
Vislor Turlough: Mark Strickson
Vorshak: Tom Adams
Solow: Ingrid Pitt
Nilson: Ian McCulloch
Icthar: Norman Comer
Scibus: Stuart Blake
Tarpok: Vincent Brimble
Sauvix: Christopher Farries
Producer: John Nathan-Turner
Director: Pennant Roberts
Scriptwriter: Johnny Byrne
