The Invisible Enemy: Part Three 1977
6.8 207 The medical center mounts a defense against alien forces trying to take the comatose Doctor while clones of Leela and the Doctor go microscopic so they can hunt down the intelligent infection that's in his head.
Runtime: 23 min
Starts: Tom Baker, Louise Jameson, Frederick Jaeger, Michael Sheard
Director: Derrick Goodwin