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Upchuck — Description
Upchuck (voiced by Dave Wittenberg) is a Gourmand (from the French word meaning glutton) from the planet Peptos XI (Peptos being the Greek word for 'cooked' or 'digested'[19] and the XI being the romanl numeral for eleven).[20] It was noted during the Ben 10 Week marathon that the Gourmand race lives on Peptos XI because they devoured the other ten planets in the system; the only reason they haven't done so to their latest home is because it's largely covered in volcanic rock.

Upchuck has four strong, adhesive tongues that can stretch to great lengths, allowing him to latch onto large objects and reel them in with relative ease. Upchuck's mouth and stomach also stretch, allowing him to swallow and digest objects larger than himself. As a Gourmand, Upchuck possesses several acid-filled stomachs that can dissolve all forms of inorganic matter, ironically meaning they can't digest organic matter such as ordinary food. The items ingested are converted into explosive balls of liquids that can be expelled at will with great accuracy.[20] Upchuck also seems to have impressive stamina for his size, as he is able to take on the impact of a moving car, as well as survive being thrown through a wall.

Upchuck first appears in the episode "The Visitor", in which an alien named Xylene enters a code into the Omnitrix to activate the form