5.50 pm Dr. Who: The Tenth Planet. An adventure in space and time starring William Hartnell as Dr. Who. Ben finds the one weakness of the Cybermen, but will he be in time to stop their terrible plan?
William Hartnell made his final regular appearance as The Doctor as the first regeneration takes place.
First Doctor regenerates - William Hartnell to Patrick Troughton - Doctor Who - BBC
