Celebrated Walking Dead creator and comics writer Robert Kirkman, who is also the co-creator and writer of the Invincible superhero universe, marks the 20th anniversary of the series with Invincible Compendium One, a hardcover reprint edition that collects the first 47 issues of the Invincible series. Invincible is the story of Mark Grayson, a seemingly normal high school kid who is really the superhero Invincible, and the story of his father, Omni-Man, an all-powerful Superman-like figure from another planet who purports to be the Earth’s protector. In this 10-page excerpt from issue four of the original series, Grayson is in class with fellow teen superhero Atom Eve when they discover their irritating physics teacher is actually a nut job who has been kidnapping students and turning them into living bombs. PW also interviewed Kirkman about Invincible on the More to Come podcast. Invincible Compendium One by Robert Kirkman, Cory Walker, and Ryan Ottley is out now from Skybound Entertainment.