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 has blown the plot wide open by introducing a show only plotline as a major cliffhanger in it's Season 3 finale.

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,