While streetworker Mickey romances Minnie, Mickey's nephews Morty and Ferdie take control of his steamroller and it's full speed ahead on a very destructive ride.
Mike discovers that being the top-ranking laugh collector at Monsters, Inc. has its benefits – in particular, earning enough money to buy a six-wheel-drive car that's loaded with gadgets. That new-car smell doesn't last long enough, however, as Sulley jump-starts an ill-fated road test that teaches Mike the true meaning of buyer's remorse.
After Monster High’s roller skating team is defeated at the Skulltimate Roller Maze tournament, the ghouls team up to face an all-boys league, with the hope of winning back the school crest and restoring school spirit.