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"We deal with the odd, the unexplained, anything on Earth. Or even beyond"
As punishment for breaking the laws of time, the Time Lords have forced the Doctor to change his appearance, taken away his ability to time travel, and exiled him to Earth... But as the TARDIS arrives, so does a meteor shower carrying an alien invasion force.
The Doctor: Jon Pertwee
Liz Shaw: Caroline John
Brigadier Lethbridge-Stewart: Nicholas Courtney
Channing: Hugh Burden
Captain Munro: John Breslin
Major General Scobie: Hamilton Dyce
Hibbert: John Woodnutt
Producer: Derrick Sherwin
Director: Derek Martinus
Scriptwriter: Robert Holmes