|Affiliations||The Circus Freaks|
|Powers and Abilities|
|Voice Actor||Jeff Doucette|
Thumbskull is a hulking figure and his size often intimidates others. As his name implies, he has a giant toenail on his otherwise bald forehead.
He joined the Circus Freaks at the beginning of his adult life.
In Secrets: Part 2, Thumbskull and the others were only shown long enough for them to get paid.
In The Darkest Night: Part One, Thumbskull and the Circus Freaks, manipulated by Death Dragon, were defeated by Psychophagus, Gwen Tennyson, and Kevin Levin. They later reappear at the end of the episode to help Death Dragon.
Thumbskull is specifically dim-witted. He follows Acid Breath's orders because he can't really think for himself.
Powers and Abilities
Thumbskull has incredible strength (though inferior to that of Four Arms).
- Secret Revealed (first appearance)
- Her Hero
- The Alliance (BBO)
- Secrets: Part 1
- Secrets: Part 2
- Time Trouble
- Ghostfreaked Out (BBO)
- The Darkest Night: Part One
- The Darkest Night: Part Two
- Thumbskull is the only one of the Circus Freaks to question Zs'Skayr.