Fourth Doctor regenerates – Tom Baker to Peter Davison

[youtube=http://www.youtube.com/watch?v=5UaNX7-cBqc] The 21st March 1981 saw Tom Baker’s near-seven year reign as the Fourth Doctor come to an end when having fallen from the gantry of a radio telescope he merged with the mysterious Watcher. Classic clip from the 1981 four-part story ‘Logopolis’, starring Tom Baker as the Doctor.