High school loser Rodney C. Duckworth (Gary Springer) is known as The Rodent until one unforgettable night when he borrows a cherry-new Chevy convertible and goes cruising for the girl of his dreams. With help of dim greaser Calhoun (David Wilson), hot-rodder T.J. Swackhammer (Brian Kerwin) and some very willing women, Rod goes from zero to hero during a wild ride of near- misses, direct-hits and bra-busting fun.

Dexter Riley is a science student at Medfield College who inadvertently invents a liquid capable of rendering objects and people invisible. Before Dexter and his friends, Debbie and Richard Schuyler, can even enjoy their spectacular discovery, corrupt businessman A.J. Arno plots to get his greedy hands on it. Slapstick hijinks ensue as Dexter and his pals try to thwart the evil Arno before he can use the invisibility spray to rob a bank.