When Mr. Bundy and several teachers disappear and turn into spiders, the school doesn't have anyone in charge, and bumbling magician Marty Q. Marvel needs to save the day.

Mr. Bundy, principal of PS 88, receives an envelope with a magic powder inside. Intrigued, young Roger, class representative that week, decides to use the powder to help him with his chore of sweeping the classroom when Mr. Bundy is out of the room. The brooms get out of control, however, and Mr. Bundy is forced to come in and break the spell.

Elliott's confidence is shattered after making a huge mistake during a do-or-die mission, but a planet-eating monster, a collapsing multiverse, and a quest to replace the Orb of Oblivion force him to put his retirement plans on hold.