Charles and Derek Moberley discovered a Krynoid pod in the permafrost while digging for samples. They brought the pod to the base, and when John Stevenson put it under a lamp, it began to grow. While Winlett was half asleep, the pod infected him and he started slowly transformed into a Krynoid. After killing Moberley, the Krynoid left the base in search of food and warmth. It later returned to base and killed Stevenson, and it tried to kill the Fourth Doctor and Sarah Jane Smith just before it was killed when the bomb Scorby planted destroyed the base. (TV: The Seeds of Doom)