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Ty and Abby notice things are afoul when an epidemic of flatulence hits Ringworm High. Donning their goop suits they uncover the source: The school chef has been replaced by a robot! This Chef-bot is distributing the fart-inducing "flatchup" to all students in place of ketchup. Further investigation leads them to the Flatchup Factory and a narrow escape from a horde of Chef-bots. They encounter the mastermind behind the smelly scheme; the nefarious Fartor! A Fart-breathing supervillain bent on revenge against his brother, Fartor reveals his mightiest creation; the fart-powered Fartzilla. Flying away to wreak havoc on the city and punish his brother, he leaves Ty and Abby to drown in a vat of flatchup. But using their finely honed Grossologist tactics, the duo manages to escape, and finally they put an end to Fartor's schemes by sabotaging Fartzilla with Ty's jet pack. The day is saved for now - but as the farts settle, Fartor vows revenge...