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.Another adventure for everyone's favourite Time Lord. After visiting their old enemy the Master (Roger Delgado) in his remote island prison, the Doctor (Jon 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.