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Seed pod

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These seed pods went through several stages. The first stage was a white round pod (hence the name). If exposed to air, it would swell up and release a cloud of spores. If these spores landed on biological matter, they would start growing and sucking up oxygen. These spores grew into a thick foamy substance which quickly covered the area. This foam would then grow pods, which repeated the process. It was estimated that after the pods covered sufficient area on Earth, it could bring down the oxygen content to 20% of the normal level. This would kill the humans, but would be perfect for the Ice Warriors.

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These seed pods went through several stages. The first stage was a white round pod (hence the name). If exposed to air, it would swell up and release a cloud of spores. If these spores landed on biological matter, they would start growing and sucking up oxygen. These spores grew into a thick foamy substance which quickly covered the area. This foam would then grow pods, which repeated the process. It was estimated that after the pods covered sufficient area on Earth, it could bring down the oxygen content to 20% of the normal level. This would kill the humans, but would be perfect for the Ice Warriors. These seed pods were immune to brute force and most acids. On the other hand, on contact with water these seed pods would shrivel up and die. To combat the infection on Earth, the Second Doctor used the Weather Control Station to initiate rain, destroying the pods. (TV: The Seeds of Death)