"The Power of Kroll (Part One)" is the seventeenth episode of of the sixteenth series of the original British science fiction television programme, Doctor Who. It is the 495th episode of the show overall and the first chapter in the "The Power of Kroll" storyline and features Tom Baker as the Fourth Doctor. It was directed by Michael Hayes with a script written by David Fisher. This episode aired on BBC One on Saturday, December 23rd, 1978.

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