Doctor Who: The Trial of a Time Lord (Part 4)

"The Trial of a Time Lord (Part 4)" is the fourth part of the "The Trial of a Time Lord" storyline, which ran through episodes 1-14 in series 23 of Doctor Who. The episodes originally aired on BBC1 from September 6th to December 6th, 1986. It was directed by Nicholas Mallett with a script written by Robert Holmes.