The Worst is the Omnitrix's DNA sample of an Atrocian originally from the planet Atrocius 0.
The Worst is a yellow, fat, and somewhat "plump" blob-like alien who wears a pair of green underwear with white stripes on it. He has elephant-like feet with three toes and bear-like hands with three claws. He also has wart-like bumps on his forehead and both arms.
The Worst's Omnitrix symbol is located on his belly button.
Powers and Abilities
The Worst can withstand heavy attacks due to his soft, blob-like body. Although he is indestructible, he still feels pain.