Pierce Wheels

Pierce is another rogue Plumber's kid that appears in Ben 10: Alien Force. It seems that Pierce is a half porcupine alien/half human.H e was believed to have been lost in someway be this was revealed to be false. He worked with a Tetramand named Manny and a Kineceleran who is also his little sister, Helen in "Plumber's Helpers". Pierce somehow ended up in the Null Void and began working with Max Tennyson to protect its inhabitants from DeVoid. He also appeared in "War of the Worlds" helping against the alien threat and when the battle is over he becomes a pupil of Grandpa Max.

Trivia
-It is weird that he is not like Helen, but is a porcupine-like alien -Pierce is the same alien like the Porcupite in Ready to Rumble. -Ben and Pierce fights, so Ben could get to Mr. Wrench ( Grandpa Max).