Forbidden to continue his travels through time and space by his fellow Time Lords, the newly regenerated Doctor (Jon Pertwee) begins his exile on 20th century Earth. His arrival coincides with a shower of strange meteorites, which are promptly investigated by the United Nations Intelligence Taskforce. Although his old friend Brigadier Alastair Gordon Lethbridge-Stewart (Nicholas Courtney) is initially suspicious of the Doctor's new appearance and personality, he is forced to ask for his help when several of the meteorites go missing. The Doctor discovers that the meteor shower was in fact the first wave of an invasion by hostile alien intelligence the Nestene; phase two begins when the Autons - deadly plastic mannequins created by the Nestene agents on Earth - launch an attack on the unsuspecting public.

Three feature-length Doctor Who adventures. In 'Doctor Who and the Silurians' (1970), Jon Pertwee stars as the third Doctor, who is called to an atomic research station in Derbyshire to investigate a series of mysterious events. His questions uncover a vicious ring of in-house saboteurs and something a bit more slimy. In 'The Sea Devils' (1972), after visiting their old enemy the Master (Roger Delgado) in his remote island prison, the Doctor (Pertwee) and Jo learn of several recent accidents at sea, all of which have been accompanied by reported sightings of strange monsters. The Doctor discovers that the creatures responsible are the Sea Devils, acquatic cousins of the Silurians who are out to reclaim the planet Earth from mankind. In 'Warriors of the Deep' (1983), The Doctor (Peter Davison), Tegan and Turlough arrive at an underwater base on an Earth in the future on the brink of Atomic War. Helping to trigger this war are the planet's original inhabitants, the Silurians and the Sea Devils, aided by their killer pantomime horse, the Myrka.

Feature-length episode to celebrate the 20th anniversary of the long-running sci-fi series. All five Doctors (Peter Davison, Patrick Troughton, Jon Pertwee, Richard Hurndall and Tom Baker) and many of their old companions are taken out of time and deposited in the Death Zone on Gallifrey. There they must battle not only the Master, but Daleks, Cybermen and Yeti in order to reach the Dark Tower and discover the Tomb of Rassilon. This special edition includes new special effects and extra footage not included in the original broadcast.