Best mates Jake and Cooper are doing a roaring trade at school, selling tubs of homemade slime, saving their money for a ride on the new roller coaster at Adrenalin World... until Jake's sister begins selling a superior product. But when the boys (with the help of a scientist uncle) invent a new 'magnetic neon gloop' that becomes all the rage, things start to go awry when it begins to grow and morph into who-knows-what. Jake and Cooper have to try to recover all the tubs of gloop, before havoc breaks loose. But are they too late?