The Biker Mice turn their motorcycles into radical Swamp Cycles when they discover a mouse damsel-in-distress stuck in the mud. Is this attractive mouse really what she appears to be – or could she be the Catatonian shape-shifter, Catalina Catacall, on a secret mission to trick the Biker Mice into revealing Stoker's secret lab where he is building a new Regenerator for Mars?