Platypus aliens
They are green platypuses with large black eyes. The leader wears a black helmet, gloves, boots, and cape, and orders all the others to fulfill his deeds. They tend to make duck-like quacking noises when they talk.

Their powers include glowing, levitation, mind control, shooting acid. They also carry deadly ray guns.

Their main goal is to destroy the world and/or turn all the tree friends into their slaves.