Goop

Goop is a Polymorph alien from the planet Viscosia

Ben first transforms into Goop in the episode The Gauntlet, when battling against a Tecadon robot.

Abilities
He 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 needs something able to be very flexable. Goop's slime is controlled by a UFO-like machine over his head, which is actually an anti-gravity projector. Goop's voice comes from his body .The UFO can cause the slime to take any shape and even hover off the ground. However, if the UFO and the slime are separated by even a short distance, the slime will become inert until the UFO recollects it. Goop's slime can be made acidic, as seen in Good Copy, Bad Copy and awsome planet Primus.

Weaknesses
As potent as Goop is, it is plagued by the weakness of being limited to the very vicinity of the UFO controlling the slime. If it is so much as separated by Goop by more than two feet, the goo goes completely inert. The UFO must fly back within close range of the goo in order to reanimate. It was shown in "Primus" that Goop's anti-gravity disk can be turned off with a push of a button, causing Goop's body to become inert. This was shown when Ben tricked by stupid Vilgax into Goop to get the Omnitrix back. Also from the episode "Primus" it is shown that the omnitrix can be ripped of goop, transforming the user back to their normal form and detaching the omnitrix from them.

Mutante