Doctor Who: The Invisible Enemy, Episode 4 (1977)

Directed by Derrick Goodwin.

Starring Tom Baker, Louise Jameson, Michael Sheard, Brian Grellis, John Leeson.

In the conclusion of the four-part story "The Invisible Enemy," the infectuous space virus known as the Swarm has escaped the Doctor's body and is prepared to conquer the Universe. Fortunately, the miniaturized clones of the Doctor (Tom Baker) and Leela (Louise Jameson) have successfully cured the real Doctor, who is thus able to set a trap for the killer virus. This Doctor Who adventure served to introduced the character of robotic dog K-9 (voiced by John Leeson). Written by Bob Baker and David Martin, "The Invisible Enemy, Episode 4" originally aired on October 22, 1977. ~ Hal Erickson, All Movie Guide

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