Bill and Ted are high school buddies starting a band. They are also about to fail their history class—which means Ted would be sent to military school—but receive help from Rufus, a traveller from a future where their band is the foundation for a perfect society. With the use of Rufus' time machine, Bill and Ted travel to various points in history, returning with important figures to help them complete their final history presentation.
A slick New York publicist who picks up a ringing receiver in a phone booth is told that if he hangs up, he'll be killed... and the little red light from a laser rifle sight is proof that the caller isn't kidding.