Doctor Who

Season 18, Episode 27

Episode Title: Logopolis (3)

Air Date: 1981-03-14

Overview:

With Nyssa from Traken unexpectedly rejoining the group, Adric aids the Monitor of Logopolis in trying to save the Doctor before time runs out. The Master, at liberty to prepare, is finally ready to reveal his true target, which unknowingly sets off the biggest catastrophe of all time.