Invincible is an adult animated superhero series on Amazon Prime based on the comic series of the same name by Robert Kirkman and Cory Walker. In eight hour-long episodes, we are introduced to Mark Greyson ( Steven Yeun), son of the most powerful superhero on Earth the alien Nolan “Omni-Man” Grayson (J.K. Simmons). He finally receives his alien superhero powers and becomes the superhero Invincible.