This Week in USA
The Invisible Enemy: Part One
Last updated 08 January 2017
10:00pm CST (04:00 GMT) < > « »
WTTW 11 Chicago
Featuring: Tom Baker, Louise Jameson, John Leeson, Michael Sheard
An alien virus infects the human crew of a refuelling station on Titan, one of the moons of Saturn. The Doctor is also infected and becomes possessed by the will of the Nucleus.
Synopsis Source: Doctor Who Guide
Broadcast Source: BroaDWcast