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Upchuck is an alien in Ben Tennyson's omnitrix. His powers is to eat anything and spit it out as a weapon. He was sampled from a Gourmand from Peptos XI, a small green species with large appetites. Upchuck can fire laser beams from his mouth (or as he called them in Upchuck's debut 'exploding loogies'), though it has only been used twice (first against the Forever King in the original series then later on against Chromastone (who had escaped from the Omnitrix) in Alien Force. He prefers to fire exploding green energy pellets instead.
Original Series Aliens
Reboot Series Aliens