So far, " Invincible" creator Robert Kirkman has failed to convince "Breaking Bad" star Bryan Cranston to appear on his show. But he has secured Cranston's former co-star, Aaron Paul, who played Scott Duvall/Powerplex in season 3 of the Prime Video series. Unfortunately, it seems Paul won't be returning for the fourth season of "Invincible," mainly due to the fact playing such a traumatized, haunted character seems to have taken a toll on the actor. In a recent interview, Paul confirmed he wouldn't be back, describing his experience of playing the tortured scientist turned supervillain as "too grueling on my psyche."

Scott Duvall was a scientist who blamed Invincible for the deaths of his sister and niece. In order to exact revenge, Duvall assumed his villainous Powerplex alter-ego, att

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