Wikimedia Commons/Invincible TV show TV Why isn't Aaron Paul back as Powerplex in Invincible Season 4? Showrunner Robert Kirkman reveals the scheduling conflict behind the recasting. March 23, 2026 AceShowbiz - Invincible showrunner Robert Kirkman has revealed the reasons behind actor Aaron Paul not reprising his role as Powerplex in the series' upcoming fourth season. The adult animated superhero drama, based on the comic series co-created by Kirkman and illustrated by Cory Walker and Ryan Ottley, follows Mark Grayson as he inherits superpowers from his father, Omni-Man.