After a small lake town is attacked by mutated, blood-sucking lampreys, an animal control specialist takes on the responsibility to bring the situation under control and protect his family.

Dave is a married man with two kids and a loving wife, and Mitch is a single man who is at the prime of his sexual life. One fateful night while Mitch and Dave are peeing in a fountain when lightning strikes, they switch bodies.

Boog's friends rally to bring him home from a Russian traveling circus.

A man is so eager to become a dad that he'll believe anything, including the notion that a baby-faced thief on the lam is really an abandoned toddler.