The Biker Mice finally gets their hands on Rump’s Regenerator just in time to be accidentally transported to Saturn thanks to Hairball's clumsy control of a transporter machine! With no way off the ringed planet, the mice turn to a race of local hip cats who inhabit Saturn. But they soon discover that these wave riding kitties are descendents of the Catatonians, the sworn enemies of the Mice! Will the slick surfin' cats of Saturn turn out to be friendâ?¦or foe?