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While investigating the crew of an exploration ship, a mysterious parasite infects The Doctor, taking over his mind. With nowhere else to turn, his companion, Leela, takes him to a medical facility where they discover the intentions of this microscopic menace.

1 Season, 4 Episodes
October 1, 1977
Science Fiction
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Doctor Who: Invisible Enemy Full Episode Guide

  • The Nucleus, now grown to human size, is determined to spawn and take over the Galaxy. Only the Doctor and Leela can stop it.

  • Miniaturized clones of the Doctor and Leela are injected into his brain. But they must now fight the virus on its own level. And its servants are closing in around them.

  • Leela and Lowe take the Doctor to the Bi-Al Foundation for help. But how can they cure an infection of the mind?

  • Deep space, 5000 AD. An Earth supply shuttle is infected by a strange sentient space-born virus, which quickly spreads to the crew of the refueling 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?

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