This is Max. Everything normal here. Nothing weird about Max - until he burps. When Max burps he becomes a huge monster, with teeth like swords, who can jump over buildings, roar and eat whole dustbins. It's great being a monster and saving people, his aim 'to protect and do good stuff', unless he sneezes when he didn't mean to, changes back, and finds himself far from home in just his pants. But something starts causing a lot of damage in their quiet suburb, and it isn't Max. His nemesis, Peregrine, a boy his age, is relentlessly on the trail of this monster, and has invented his POOP (Portable Operating Omni Prison) machine to trap it. Max has to catch the real culprit, before Peregrine can catch him!