Giant killer plants, a mad millionaire with a greenhouse fetish, and the Doctor beating people up like he’s auditioning for The Avengers (the spy show, not the superheroes).
Short Synopsis
When two scientists in Antarctica thaw out a suspicious seed pod (because what could possibly go wrong?), it unleashes the Krynoid — an alien plant that infects humans and turns them into giant salad monsters. The Doctor and Sarah Jane must stop the infestation before Earth becomes one big compost heap.
Extended Storyline
Our story begins in Antarctica, where a couple of scientists discover a strange green pod frozen in the ice. Naturally, they decide to defrost it immediately. (Because apparently no one in the Doctor Who universe has ever watched The Thing.) Surprise! It contains a Krynoid, an alien plant that infects living creatures and slowly turns them into human-plant hybrids. Imagine body horror meets houseplant.
The Doctor and Sarah Jane arrive, and Tom Baker wastes no time berating the scientists for being idiots. He’s not wrong. One of them has already been infected, sprouting green veins like a bad Halloween costume and developing a sudden hatred of Miracle-Gro.
Enter Harrison Chase, a millionaire eccentric and world-class plant enthusiast, whose idea of a good time is feeding people to his compost machine. (No, really.) Chase wants the pods for himself because he’s convinced plants are superior to humans, and he intends to help them take over the Earth. His private mansion is a cross between Kew Gardens and a Bond villain’s lair, complete with goons who look like they answered the wrong casting call for EastEnders.
When the Krynoid fully mutates, it grows into a giant vegetable kaiju, smashing up Chase’s estate like it’s auditioning for Day of the Triffids II: The Revenge. Sarah Jane spends a lot of time getting captured (again), but she also proves once more that she’s the most resourceful human on Earth — except maybe when she almost becomes plant food in Chase’s compost grinder. (Doctor Who was definitely going through a “Sarah in peril” phase here.)
Meanwhile, the Doctor gets unusually physical in this story. He throws punches, uses guns, and even wields a flamethrower like he’s about to join UNIT’s special ops division. It’s Tom Baker at his most action-hero, and it’s both glorious and faintly ridiculous.
The final showdown sees the Krynoid towering over Chase’s estate, threatening to engulf London in vines and turning every episode of Gardener’s World into a horror show. UNIT shows up with airstrikes, the Doctor wrestles with Chase in the greenhouse (a fight that features a lot of broken glass), and the giant plant is finally destroyed in a glorious explosion. Chase, naturally, gets eaten by his beloved compost machine. There’s a lesson in there somewhere about loving nature too much.