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In this second episode of the four-part story arc "An Unearthly Child," Doctor Who (William Hartnell) and schoolteachers Ian and Barbara (William Russell, Jacqueline Hill) have journeyed some 100,000 years back time. Captured by a pre-civilized race, the Doctor and his companions are thrown into the Cave of Skulls. There they must figure out a method of summoning up that remarkable new invention called "fire" -- or else face a horrible death at the hands of their captors. Written by Anthony Coburn, "The Cave of Skulls" first aired on November 30, 1963.