Wikimedia Commons/Invincible Season 4 TV Invincible Season 4: Mark Grayson faces his most brutal foe yet, Thragg. The epic Prime Video showdown arrives in two weeks. March 16, 2026 AceShowbiz - Prime Video has unveiled a new teaser for the upcoming fourth season of Invincible, centering on the fearsome and powerful antagonist Thragg, voiced by Lee Pace. As the series returns in two weeks, fans are eager to witness the intense confrontation between the hero Mark Grayson and one of his most dangerous foes yet.