Following this week’s Season 4 finale of Invincible , creator Robert Kirkman explained one major change from the comic books. The Prime Video series’ showrunner, who also created the comic book source material, noted that he gender-swapped the Tech Jacket hero Zack Thompson to Zoe Thompson in order to “correct a shortcoming” from when he first created the comic in 2002. “ Tech Jacket has his own series and his own stories and is definitely a fully well-rounded character, but I think in the context of Invincible and the way we adapted the Viltrumite War storyline, if Zack were to show up, there’s not a lot that you’re gonna get from that character that you’re not getting from Oliver or Mark,” he explained to The Wrap . “There’s just a lot of similarities there.” Kirkman added, “One of the downsides of Invincible is Cory Walker and I were like 23 and 21 when we started that book, and your default when you’re not really paying attention is yourself. Every time we introduce another character, ‘Oh look!…