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"This is our planet. My people ruled the Earth when man was only an ape"
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Arrested after the events at Devil's End, the Master has been incarcerated at a top-security prison on a remote island off the south coast of England. When the Doctor and Jo Grant pay a visit to their old enemy, they find him a reformed character. But can the spate of mysterious shipping accidents and garbled reports of sea monsters in the local area really be a coincidence? The Doctor soon finds himself pitted against the Sea Devils, an ancient race of reptiles intent on eliminating Mankind and reclaiming the Earth for themselves...
The Doctor: Jon Pertwee
Jo Grant: Katy Manning
The Master: Roger Delgado
Captain Hart: Edwin Richfield
Trenchard: Clive Morton
Commander Ridgeway: Donald Sumpter
Chief Sea Devil: Peter Forbes-Robertson
Producer: Barry Letts
Director: Michael Briant
Scriptwriter: Malcolm Hulke