Innocent Zero arrives to claim Mash! While Wahlberg faces down the villain, Mash and the others fight Innocent Zero's cronies in a race to help their headmaster. But they encounter a major setback when Lance and Dot are suddenly turned into babies and sapped of nearly all their power! Meanwhile, Wahlberg finds himself up against an unexpected opponent when his long-dead teacher Adam is resurrected to fight him! Will Mash and the others be able to save the school from its greatest threat yet?!

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