5 episodes were broadcast on February 22nd
Episode 1 of 7 from Marco Polo
In the Himalayas and the Doctor, Barbara, Ian and Susan meet Marco Polo and join him on his journey.
An Ice Warrior invasion fleet is on its way to the Moon. The Doctor devises a plan to destroy the Martian fungus.
Arriving on Earth, the Doctor, Harry and Sarah meet a group of stranded human colonists.
Adric manages to escape while Tegan is brought under the complete control of the Terileptil.
The Doctor and his companions have reached the Terminus, discovering a terrible danger.
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