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Harrison Chase was an eccentric millionaire whose primary hobby was botany, having assembled the world's largest collection of plants. He disdained humanity in favor of plant life, even composing music for them.
Chase learned from Richard Dunbar that a Krynoid pod had been found in Antarctica. As a collector of rare specimens, Chase became obsessed with obtaining them, and sent Scorby and Arnold Keeler to steal it. He allowed the Krynoid to infect Keeler, who slowly transformed into Krynoid himself. As the creature grew bigger and more powerful, Chase became psychically linked with it, and began to aid it in its plans to destroy animal life and become the dominant life form on Earth.
Opposed by the Doctor and Sarah Jane Smith, Chase tried to kill them by by putting them into his compost shredder, which he regularly used on human bodies. During his fight with the Doctor, Chase fell into his own shredder and was killed. (DW: The Seeds of Doom)