“I Would Tell Him To Go Into Therapy”: 'Invincible's Jason Mantzoukas Reveals What Advice He'd Give to Rex Splode

Invincible is a series with countless stand-out characters, and we're not just talking about Mark Grayson (Steven Yeun) and Omni-Man (J.K. Simmons). Over the past two seasons, it would be hard to argue against Rex Splode, voiced by Jason Mantzoukas, who went from an immature jocky superhero in the first season and a half to somebody who is working to improve himself after a near-death experience.