The Doctor gets infected by space herpes and builds a robot dog to cure himself. Classic Who!
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.
Practical Effects
Gloriously unconvincing giant antibodies in the bloodstream
Acting
Tom Baker selling absolute nonsense with total conviction
Production
K-9 debuts and immediately upstages everyone
Director
Derrick Goodwin
Trivia, insights & behind the scenes
K-9 was created specifically because the production team wanted a robot who wouldn't need oxygen or require expensive location shooting.
This serial aired during the 1977 UK winter of discontent, making its 'infection from space' plot weirdly resonant with contemporary anxieties about contamination and collapse.
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