Synopsis: In the second episode of the four-part story "The Three Doctors," the present Doctor (Jon Pertwee) and his two predecessors (William Hartnell, Patrick Troughton) investigate the strange, roving black hole in space which has been depleting the Time Lords of their energy. It turns out that the instigator of this crisis is the vengeful Time Lord Omega...
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Starring: Katy Manning, Nicholas Courtney, Patrick Troughton, Jon Pertwee