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.

Doug McClure triple bill, based on the novels by Edgar Rice Burroughs. In 'Warlords of Atlantis' (1978) McClure plays Greg Collinson, a Victorian explorer and adventurer leading a motley crew of scientists to find the lost continent of Atlantis. Battling sea monsters and fantastical creatures, the crew eventually stumbles across the lost continent and are shocked to discover the Atlanteans' deadly secret. Collinson must now use all of his experience and knowledge to help his crew escape. 'At the Earth's Core' (1976) sees McClure joined by Peter Cushing, playing two explorers attempting to drill through the centre of the planet only to discover the sinister underground kingdom of Pellucidar, where a downtrodden populace are enslaved by the evil Mahars. 'The Land That Time Forgot' (1975) sees a German submarine holding American prisoners in World War One accidentally crash into a mysterious island in the middle of the Atlantic. Exploring this lost island, the mixed crew of Germans and Americans discover a prehistoric landscape untouched by the modern world, where savage dinosaurs and primitive tribes exist in mutual enmity. The Germans and Americans must put aside their own prejudices in order to survive.