Fungal Brain

From Ben10versepedia

The Fungal Brain is the head of a fungus colony which took control of Camp Opinicon in the episode "Camp Fear". The scientific name for such a structure in real fungi is called a mycelium; incidentally, the Fungal Brain prefers to be called by that term. It has many mushroom-like minions who go and attack various campers. Its plan was to take control of the entire planet by spreading its spores into the atmosphere. It was killed when Ben threw a can of antifungal powder into his mouth, poisoning it and killing all its minions in the process.