The Doctor and Sarah Jane are called in to investigate mysterious alien seed pods found at a science base in Antarctica, but when a scientist is infected and turned into a plant monster, he realizes the seed is a sentient, intergalactic weed called a Krynoid that can transform humans into plants and feeds on animal life. When a rich and insane botanist named Harrison Chase sends men to steal one of the pods to bring it back to London, the Doctor and Sarah Jane must return to stop him from allowing the Krynoids to spread.

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