When The Doctor answers a distress call from a shuttle crew who have been infected with an intelligent virus, he too becomes contaminated. The only solution is to create clones of The Doctor and his companion Leela (Louise Jameson) to enter his body and fight the virus.
Deep space, 5000 AD. An Earth supply shuttle is infected by a strange sentient space-born virus.
Leela and Lowe take the Doctor to the Bi-Al Foundation for help.
Miniaturized clones of the Doctor and Leela are injected into his brain.
The Nucleus, now grown to human size, is determined to spawn and take over the Galaxy.
Fourth Doctor
Tom Baker
Leela
Louise Jameson
Lowe
Michael Sheard
Safran
Brian Grellis
Meeker
Edmund Pegge
Silvey
Jay Neill
Crewman
Anthony Rowlands
Nucleus
John Leeson (Voice)
Professor Marius
Frederick Jaeger
Parsons
Roy Herrick
Marius' Nurse
Elizabeth Norman
Reception Nurse
Nell Curran
K-9 (Voice)
John Leeson
Opthalmologist
Jim McManus
Cruikshank
Roderick Smith
Hedges
Kenneth Waller
Medic
Pat Gorman
Nucleus
John Scott Martin
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