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In the second episode of the four-part story "The Brain of Morbius," mad doctor Solon (Philip Madoc) intends to transplant the brain of evil Time Lord criminal Morbius into the body of the Doctor (Tom Baker). To do this, Solon must enlist the aid of the Sisterhood, the mystic cult currently in charge of the devastated planet Karn. Meanwhile, the members of the Sisterhood become convinced that the Doctor intends to end their existence. Originally telecast on January 10, 1976, "The Brain of Morbius, Episode 2" was written by Terrance Dicks.