Krynoid

Krynoids were large, carnivorous alien plants that could be thought of as galactic weeds. On planets where the Krynoid took root, all animal life would become extinct, as Krynoids desired that all plants should win against the animals that ate them.

Krynoids travelled through space as tendrils in small pods, always in pairs. They were very hardy and could easily withstand the extreme cold of space, (TV: The Seeds of Doom) although snow and ice could still slow them down and render their pods inert. (PROSE: An Apple a Day...)

A Krynoid itself was bulky, covered in tendrils and vines, some of which ended in red flower-like structures. They had an undefined anatomy with no front or back. Though they had great tolerance for cold, high temperatures could damage them. They required animal proteins while young, but could survive on normal photosynthesis later in life, and gathered nitrogen directly from the air without a need for roots. Over time, Krynoids were also able to channel their power into other plants, at least within a mile radius; they were also able to psychically possess other humans, though this may have been due to some humans' sympathy for plants.

While they were unaffected by gunfire and lasers, they were affected by being cut as well as fighter plane missiles, (TV: The Seeds of Doom) and could be killed with special rockets. (COMIC: Don't Step on the Grass) Krynoids couldn't live in environments with high carbon levels. (PROSE: The Taking of Chelsea 426) One strain of Krynoids were affected by high-pitched noises, allowing the original consciousness of their host to reassert itself temporarily. (AUDIO: Hothouse)