Goop is a Polymorph from Viscosia and a playable alien.
Goop is a shape shifting, self regenerating, almost indestructible green blob that weighs 200 pounds. Goop can wrap his slimy body around his foes and throw them around. Ben usually becomes Goop to avoid damage or when he needs a flexible form. Goop controls his slime with an Anti-Gravity Projector in the shape of a small UFO, and if the slime and the Anti-Gravity Projector are separated by at least two feet the slime will become inert until the Anti-Gravity Projector recollects it, though in recent appearances, it seems that he can move without it unless the button on it is turned off.