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In the third episode of the four-part story "The Space Museum," the Doctor (William Hartnell) and his companions have passed through the Fourth Dimension, the first step in their journey back in time. Having glimpsed into the horrible future that awaits them at a Morok-controlled space museum, the Doctor must somehow alter the course of history. The trick is to return to the precise moment when the crew of the TARDIS became enmeshed in the political intrigues of the planet Xeron. Written by Glyn Jones, "The Search" first aired on May 8, 1965.