Upchuck

Upchuck is a Gourmand (a play on the word, Gourmet) alien from the planet Peptos XI. He was the 16th alien.

Ben first transformed into Upchuck during the episode The Visitor, when an alien named Xylene enters a code into the Omnitrix, activating the form.

Abilities
Upchuck is a Gourmand from Peptos XI. It has been stated that the reason why Upchuck can only digest inorganic material is because his species ate all other organic matter on their original home planet Peptos forcing them to eat the planet itself for sustenance thus destroying it and forcing them to move to three more planets Peptos II through IX. Upchuck has four strong, adhesive tongues that can stretch to great lengths, allowing Upchuck to latch onto large objects and reel them in with relative ease. Upchuck's mouth and stomach can also stretch, allowing him to swallow and digest objects fairly larger than itself. Upchuck possesses several acid-filled stomachs that dissolve almost all forms of matter, except ironically, ordinary human food and other organic matter. The items ingested are converted into explosive balls of liquids that can be expelled at will with great accuracy, he can also make them curve, like a boomerang, shuriken, or frisbee. This ability was demonstrated in Ben 10: Secret of the Omnitrix. He can also use the energy as an acid. Upchuck also seems to be ble to take a surprising amount of punishment for a creature of its size, able to take the brunt force of a moving car impact as well as surviving after being thrown through a wall.

In the season 4 finale episode Upchuck was able to grab the sub-energy from Driscoll, the Forever King and swing him around. The sub-energy gave Upchuck super speed for a while. Afterwards Upchuck disperced it by firing the rest of the sub-energy into sky from Mount Rushmore vapourizing the remaining three faces (the fourth one was destroyed in altercation with Vilgax).

In the Ben 10: Alien Force episode War of the Worlds: Part 1, the "teenage" version of Upchuck showed an ability of being able to fire blasts by first consuming energy. We also saw that in War of the Worlds episode that Upchuck can not only ingest in-animate objects, but also projectiles being fired, such as lasers, etc. Upchuck also did not use the four adhesive tongues that he possesses or used to possess, however, Dwayne McDuffie has revealed that Upchuck still has access to them and just has not found a reason to use them yet. In In Charm's Way it appears that Upchuck has gained the abillity to digest organic matter as he was able to drink a giant Mr. Smoothy sign that came alive by Charmcaster (though he later barfed a small amount onto Kevin). Upchuck uses these tongues in the game Ben 10: Alien Force: Vilgax Attacks so it is proved that he still has them. Upchuck can also keep swallowing and blasting a beam of energy as seen in Vengeance of Vilgax, when the escaped Chromastone keeps blasting the energy beam back to Upchuck and he keeps swallowing it and regurgatating it back with no signs of injury.

Ultimate Alien
Upchuck already appeared in Duped. He looks same like Alien Force.

Weaknesses
Upchuck is unable to swallow ordinary human food. In the episode Ben 4 Good Buddy, he remarks that he wasn't able to digest it because the acids in human food are not stable enough to digest. He is able to self destruct, probably after a continued amount of bad digestion. Upchuck also has a limit to how many big objects it can swallow. He is also slow when he eats a lot of things and becomes excessively fat, in his premiere episode  when he finishes eating the mecha-robot, he rolls around due to his fatness. Otherwise, he is somewhat quick, considering his small size, but due to his body structure his speed is limited. This weakness is now gone in Alien Force.

Trivia

 * He was unlocked by Xylene.
 * Upchuck's appearance varies through age, as shown in War of the Worlds: Part 1, as he looks more camouflaged and has narrow eyes as Ben is 15.
 * Upchuck appears in Ben 10: Ultimate Alien in the episode Duped as the Ultimatrix still has the aliens from the Omnitrix.
 * Upchuck went through 13 or 14 design changes in order to become the way he was in the original series.
 * Unlike the original series he does not wear clothes starting in Alien Force.


 * On of the three Ben's in Duped, transformed into Upchuck.
 * In Italian version of the series he is called "Vomito" (vomit).
 * In the Brazilian version of the series he is called "Glutão" (Glutton).