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Sir Colin Thackeray was the head of the World Ecology Bureau during the 1970s.

A scientific expedition in Antarctica transmitted photos of the Krynoid pod they had discovered to Thackeray. He insisted that the Fourth Doctor investigate it. After learning the threat the Krynoid posed to the world, he called in UNIT to deal with it. He went to Harrison Chase's mansion to view the attack.

The Doctor later offered him to travel in the TARDIS for a holiday but he declined because his wife was expecting him for tea. (TV: The Seeds of Doom)

After the events of the Krynoid's attack, he ordered cuttings to be taken from Krynoid remains, which were later stolen and eventually used for research by environmentalist Alex Marlowe. (AUDIO: Hothouse)

He had died by the early 21st century. (AUDIO: Hothouse)

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