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.
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 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.
Rufus has a fuzzy prophetic dream about chicken kiev and dark future where the Stallions broke up and went their separate ways before making it big and saving the world. He must travel to 1996 to find out what went wrong and how to fix it.