|Powers and Abilities|
|First Appearance||Last Laugh|
He is a buff green skinned person with a black outfit.
In Ben 10: The Omniwars, he has his Omniverse appearance, but the toe on his head is now yellow and rotten. He wears a new suit, which consists of purple sleeves with black stripes.
In Ben 10: Unbound, he has his original series appearance but with his Omniverse outfit. He is now more buffer and his toenail is bigger and rotten.
Ben 10: The Omniwars
- Freak City♙(first re-appearance)
Thumbskull will return in the third season.