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In the third episode of the four-part Meglos, the title character has disguised himself as the Doctor (Tom Baker) and stolen the power source of the planet Tigella, the better to restore the tattered glories of Meglos' own race. Meanwhile, the Doctor tries to figure out a means of escape, so that Tigella will not be destroyed by Meglos' machinations. Jacqueline Hill, who'd played the Doctor's traveling companion Barbara Wright in the earliest episodes, guest stars as Lexa, leader of the Deon race. Written by John Flanagan and Andrew McCullough, "Meglos, Episode 3" first aired on October 11, 1980.