Invincible is an Image Comics and Amazon TV series named for its superhero, "Invincible" ("Mark Grayson"). Created by writer Robert Kirkman with artists Cory Walker & Ryan Ottley. Mark Grayson is a normal teenager, except for the fact that his father Nolan is the most powerful superhero on the planet. Shortly after his seventeenth birthday, Mark begins to develop powers of his own and enters into his father's tutelage.