Invincible creator Robert Kirkman has teased more of what to expect after season 3's hellbound post-credits scene – and it's bringing in material that was ultimately left out of the comics. In the Invincible season 3 ending,

Invincible fans got the return of a character that hasn't been seen in a while at the end of season three, and the creators have big plans for him.

Robert Kirkman, the creator of Invincible, recently shared an exciting detail about Season 4. He revealed that Mark Grayson might take on a new enemy—the Devil himself. This storyline was never used in the original comics,