Four disc boxed set features all three Silurian and Sea Devil stories. This classic Doctor Who DVD includes two stories starring Jon Pertwee as the third Doctor, plus a third story starring Peter Davison as the fifth Doctor.

Doctor Who and the Silurians (1970 – Jon Pertwee)
The Doctor and Liz Shaw are summoned to investigate the strange happenings at an underground research centre in Derbyshire. What they uncover is a group of intelligent reptiles, the Silurians, who went into hibernation millions of years ago but have now been revived.

Extras Include:

• Commentaries
• What Lies Beneath – a documentary showing how the socio-political climate of the late sixties and the hopes and fears of the British population helped to shape this Doctor Who story.

The Sea Devils (1972 – Jon Pertwee)
On a visit to their old enemy, the Master who resides in a high-security prison on a remote island, the Doctor and Jo Grant learn that ships have been mysteriously disappearing at sea. There are garbled reports of sea monsters but the truth is far worse.

Extras Include:

• Commentaries
• Going Underground – the story's producer, director and designer discuss the problems of shooting underground caves and cave-dwelling monsters
• Now and Then – a documentary narrated by Geoffrey Palmer comparing the locations used in the story during production with how they appear today
• Musical Scales – a look at an extraordinary era of musical experimentation within Doctor Who in the late sixties and early seventies, with special emphasis on the musical scores for ‘Doctor Who and the Silurians’ and ‘The Sea Devils’
• Colour Silurian Overlay – a fascinating featurette explaining how the story was restored to its present glory using a combination of black and white film prints, off-air American Betamax video recordings and modern video processing technology
• Photo Gallery

Warriors of the Deep (1984 – Peter Davison)
The Doctor, Tegan and Turlough arrive at an underwater Sea Base on Earth, where a scientific and military team led by Commander Vorshak are monitoring a rival power bloc. Under the sea, old adversaries of the Doctor's awaken, with the goal of provoking a global war and reclaiming Earth.

Extras Include:

• Commentaries
• The Depths – production and cast members recall with some amusement their experiences of working on the story
• They Came from Beneath the Sea – a featurette focusing on the realisation of the story's non-human cast – the Silurians, the Sea Devils and the dreaded Myrka
• Science in Action – BBC Schools presenter Kjartan Poskitt talks to visual effects designer Mat Irvine about some of the techniques and plastic materials he uses in his job
• Trailers
• Photo Gallery