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In the conclusion of the four-part Meglos, the Doctor (Tom Baker) has managed to escape a time loop, not to mention his mercenary captors. Will he be in time to prevent Meglos (Christopher Owen), the power-hungry solo survivor of the Zolfa-Thuran civilization, from destroying the planet Tigella? Aiding and abetting the Doctor is Lexa, leader of the Deon race, played by Jacqueline Hill, some 17 years after her portrayal of the Doctor's traveling companion Barbara Wright. Written by John Flanagan and Andrew McCullough, "Meglos, Episode 4" first aired on October 18, 1980.