Martin is hot on the trail of his missing parents when he's called on to become Fartboy, the world's SMELLIEST super hero. A new doctor is in Sparkletown, and he is DISGUSTING. His cures are made from vacuum cleaner dust, mouldy cornflakes, crusty crumbs and filthy fur. Martin's search for Mum and Dad is put on hold-only a fart a day keeps THIS doctor away!