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Making its debut on February 26, 1972, the six-part Doctor Who story "The Sea Devils" is a sequel to the seventh-season adventure "Dr. Who and the Silurians." Though he has finally been thrown in prison by the Doctor (Jon Pertwee), the renegade time lord the Master (Roger Delgado) is still very much a threat to the well-being of the universe. Having effectively taken over the prison, the Master sets in motion his plan to conquer the world, with the help of some sea-dwelling "cousins" of the reptile-like Silurian race. "The Sea Devils, Episode 1" was written by Malcolm Hulke.