Wikimedia Commons/Invincible TV Show TV Invincible co-creator explains why new character specials like Rex Splode aren't happening anytime soon, citing a packed production schedule for Seasons 4 an... May 4, 2026 AceShowbiz - Invincible fans hoping for more specials focusing on characters like Rex Splode will be disappointed, as the show's co-creator has shared reasons why these won't be happening soon. As the animated series reaches the midpoint of its Season 4 run on Prime Video this Spring, the production team is already hard at work on Season 5.