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In the fourth episode of the six-part story "The Sea Devils," the Doctor (Jon Pertwee) tries to "reach" the title characters, a race of bipedal earth reptiles. Knowing that the Master (Roger Delgado) intends to use the Sea Devils to wipe out all mankind, the Doctor attempts to appeal to the creatures' better nature and advanced intelligence -- just as he'd previously done with the Devils' distant relations, the Silurians. But negotiations quickly break down, and the earth is once more plunged into peril. Originally shown on March 18, 1972, "The Sea Devils, Episode 4" was written by Malcolm Hulke.