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In the third episode of the four-part story "The Brain of Morbius," the Sisterhood of Karn are convinced that the Doctor (Tom Baker) intends to steal the precious elixir which keeps them alive. Thus, the Doctor is captured and sentenced to be burned at the stake -- something of a setback for mad doctor Solon (Philip Madoc), who intends to use the Doctor's body as the new home for the brain of infamous Time Lord criminal Morbius. Meanwhile, Sarah (Elisabeth Sladen) finds herself with the unusual responsibly of rescuing the Doctor, thereby reversing the usual procedure. Originally telecast on January 18, 1976, "The Brain of Morbius, Episode 3" was written by Terrance Dicks.