Stink Arms

Stink Arms is a fusion alien that premiered in the in the episode Dr. Animo and the Mutant Ray. He is the first fusion alien used in the episode. Ben used Stink Arms to fight Dr. Animo's mutant frog, which didn't go according to plan because of the alien's limited abilities due to the fusion.

Appearance
Stink Arms mostly resembles Four Arms with a few Stinkfly characteristics. His four eyes are replaced by Stinkfly's eye stalks, and the stripe on his uniform is replaced by the jagged line on Stinkfly's suit. He also has Stinkfly's tail and wings. The Omnitrix symbol is on his face.

Powers and Abilities
Stink Arms's powers caused a few issues. Four Arms's super strength was weakend by Stinkfly's lesser strength ("Ugh! Either you 'gained weight since last time, or I'm not as strong as I used to be!" ). Also, Four Arms's huge mass actually made it almost impossible to fly, only allowing him to hover 2 feet above the ground. Oddly enough, Kevin (during his first mutation) and Devlin Levin, with the same huge mass as Four Arms, were able to fly (either because Devlin and Kevin had Ghostfreak's levitation ability or that because of the Omnitrix to be unintentionally damaged by Ben).

Trivia

 * Stink Arms can be created in one of Bandai's Ben 10 Games along with other fusions.