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In the fifth episode of the six-part story "The Time Monster," the Master (Roger Delgado) continues in his efforts to use the dreaded "time-eater" Kronos (Marc Boyle) as a means of conquering the universe. But his plan hits a snag when Queen Galleia (Ingrid Pitt), who originally helped the Master gain access to the Atlantan crystal harboring Kronos' spirit, turns on the villain. Now also at the mercy of Kronos, the Master must rely upon his archrival, the Doctor (Jon Pertwee), to stay alive. Written by Robert Sloman, Doctor Who: The Time Monster, Episode 5 originally aired on June 17, 1972.