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When scientists in the Antarctic uncover a mysterious seed pod, the Doctor is called in to investigate. He soon realises it is extraterrestrial and extremely dangerous. At the same time, however, ruthless millionaire plant-lover Harrison Chase has learned of the find and decides he must have the pod for his collection of rare and beautiful flora. Meanwhile the pod itself harbours intelligent life with sinister plans of its own...

Director : Douglas Camfield

Writer : Robert Banks Stewart

Cast

Tom Baker

Elisabeth Sladen

Tony Beckley

Kenneth Gilbert

Michael Barrington

Sylvia Coleridge