The fourth and final installment of the New York Times bestselling graphic novel series based on the worldwide phenomenon The Last Kids on Earth! The kids must face a mysterious new threat: Someone is stealing kids' schoolwork-margin doodles and turning them into an army of kooky living sketches! But what will the heroes do against the manic, illogical brilliance of living doodles?! While they fight, Boy Lightning's head and drawing arm are kidnapped by our new villain and taken into the wastelands beyond the borders of Apocalyptia! Now our team must brave heretofore unseen worlds (Carnivorous Plant Apocalypse and Slime Apocalypse, to name a few) in order to infiltrate the Doodle Temple of Doom and save Jack from the machinations of DOODLEHEAD, a villain with a hand-drawn head who plans to siphon all of Jack's superpowers and his life essence to make the doodle-creatures permanent and take over all of Apocalyptia!.