Doctor Who, Season 20, Mawdryn Undead Episode guide
4/4 Turlough plots with the Black Guardian to bring the Doctor down once and for all.
First broadcast: 09 Feb 1983
3/4 Mawdryn and his eternal mutants are awake and reveal the truth.
First broadcast: 08 Feb 1983
2/4 Both Tegan and the Doctor meet the Brigadier but in different time periods.
First broadcast: 02 Feb 1983
1/4 Caught in a warp ellipse, the TARDIS is drawn to a huge spacecraft orbiting Earth.
First broadcast: 01 Feb 1983