Sci-Fi Drama Adventure
A three-man rocket crew are nearly done with their mission to Titan Base until a course change puts the rocket in the path of a strange cloud in space. By the time they arrive, they have come under the control of a sentient virus which threatens the galaxy. When the TARDIS picks up an emergency message, it flies into the cloud, infecting the Doctor. To save himself and others, he must undertake a dangerous journey.
Directed by
Derrick Goodwin
Written by
Bob Baker, Dave Martin
Michael Sheard
Lowe
Tom Baker
The Doctor
Louise Jameson
Leela
Edmund Pegge
Meeker
Frederick Jaeger
Professor Marius
Brian Grellis
Safran
John Leeson
K-9 Mk. I (voice) / Nucleus (voice)
Jay Neill
Silvey

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