Mumm-Ra has a phial of miniaturization gas. Vultureman builds a mechanical Wolfrat to infiltrate the gas into the Cats' Lair. The ThunderCats are immediately reduced to nine inches high. Knowing how vulnerable the ThunderCats are in this state, Mumm-Ra orchestrates a mutant attack on the Cats' Lair. The ThunderCats' only hope is Snarf; they armor Snarf and use him as a battle charger while Tygra works on an antidote. The ThunderCats finally take the antidote, and Snarf, getting an accidental whiff of it, grows to huge proportions. In his gigantic state, Snarf terrifies the mutants and puts them to flight.