Bill and Ted lose an Elvis impersonating competition. So they decide to go back in time to help the real Elvis, become the King of Rock and Roll. But their efforts are disastrous when they bring the Elvis back to the future and he loses an Elvis impersonation contest.

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.