Mycelium

The Fungal Brain/Mycelium is a evil plant like creature that commands fungi at Camp Opinicon and two of his victims were Ben and Grandpa Max. Ben fights him as Wildvine, but doesn't work. Soon, he drops his bottle of Athlete's Foot Powder into his mouth, killing him and the fungal warriors. He likes to be be referred as the Mycelium. He only appears in one episode. He was the first villain to be confronted by Wildvine.