Classic Who S15 • Serial 6 · (6 episodes) The Invasion of Time Sets: Doctor Who (1963-1996) Fourth Doctor 68% 1,311 votes Watch on iPlayer Watch on BritBox Novelisation: "Doctor Who and the Invasion of Time" TARDIS Wiki Share this page {{ shareFeedback }} Copy link {{ copyFeedback }} Overview Reviews Transcript Quotes Quotes Spoiler warning! “Maybe I am getting too young for this sort of thing.” — Fourth Doctor, The Invasion of Time “There's no point in further discussion. Discussion is for the wise or the helpless, and I am neither.” — Leela, The Invasion of Time Login to track and rate! Signal Strength: 50% What's this? Characters & Enemies Fourth Doctor K9 Leela Sontarans Vardans Also featuring: Andred Borusa K9 Mark I Commander Stor Available in: Bred For War – The Sontaran Collection DVD Average. Rating: 68% The Invasion of Time DVD Average. Rating: 65% The Collection – Season 15 Blu-Ray Average. Rating: 66%