Bill and Ted fall for two girls they believe they are destined to be with but get rejected for being awkward, so they go back and time and bring Casanova to the present to analyze his seduction techniques, which backfires.

Bill and Ted go back in time to meet Einstein and learn why everyone ironically calls them by his name. However, he turns out to be frustrated by the theory of relativity so he quits physics and turns to his true passion - stand up comedy.