Mawdryn Undead

Mawdryn Undead is the third serial of the 20th season in the British science fiction television series Doctor Who, which was originally broadcast in four twice weekly parts from 1 February to 9 February 1983. The serial was the first of three loosely connected serials known as the Black Guardian Trilogy, and introduced Mark Strickson as a new companion, Vislor Turlough, as well as reintroducing Nicholas Courtney as Brigadier Lethbridge-Stewart. The character had not been seen on the series since the Fourth Doctor serial Terror of the Zygons almost eight years earlier.