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The Master (Roger Delgado) returns to further bedevil his arch rival, the Doctor (Jon Pertwee). This time, the renegade Time Lord arranges for a "friendly" organic spacecraft to land on Earth, offering to give mankind a food-replenishing element called Axonite. But the Doctor suspects that neither the Master nor the residents of the planet Axos are as altrustic as they pretend to be. Beginning its four-episode run on March 13, 1971, "The Claws of Axos" was written by Bob Baker and David Martin.