Last updated 09 January 2020


Part Three

Series Episode Number: 460

World Premiere: Sat 15 Oct 1977 - 6:13pm BST [BBC One] (United Kingdom)
First Broadcast: Thu 12 Jun 1980 - 5:30pm CDT [WTTW 11 Chicago]
Running Time: 23 minutes 28 seconds

7.50 Million (UK)


Chart Position: 65 () (UK)

Recorded on Mon 25 Apr 1977 in TC6



The Doctor and Leela have been cloned and miniaturised and injected into the Doctor's body. There they must fight the virus on a microscopic level before time runs out.