Fatty Roswell is an obese alien frycook who served as the boss of "Happiness" in Earthworm Jim 3D. He came into conflict with Jim because he believed that his four brains held "The Key to the Ultimate Burger", a possible reference to Douglas Adams's The Hitchhiker's Guide to the Galaxy. This is inconsistent with previous games, as Jim loves cows, and would never eat them. His name is obviously a reference to "fatty" being a nickname for overweight people and the famous town of Roswell, New Mexico, where a UFO was believed to have landed. The only other beings of his species in the series are his Alien Helpers.

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