The Invisible Enemy (1)

Overview

Deep space, 5000AD. An Earth supply shuttle is infected by a strange sentient space-borne virus, which quickly spreads to the crew of the refuelling station on the moon Titan. Even worse, the Doctor himself falls victim. But why is Leela immune, and what is the virus's ultimate goal?

Guest Stars

Michael Sheard

Lowe

Brian Grellis

Safran

Edmund Pegge

Meeker

Jay Neill

Silvey

Anthony Rowlands

Crewman

Cy Town

Extra (uncredited)