Bill and Ted accidentally break Missy's... I mean, Mrs. Preston's Antique Chinese vase and must go on a most superdacious adventure back to Antique China to get her a new one before she returns home.
Bill and Ted are flunking music appreciation and are given an assignment about classical music, and end up meeting musical personalities such as Wolfgang Amadeus Mozart and Little Richard. They also get in trouble with history's greatest archer, William Tell.—GusF
The dudes are taking a Latin class and are given an assignment about a rare ancient Roman coin, and they end up going to Latin America in 1450 and Rome in 44 B.C. They also save Julius Caesar from being assassinated.—GusF
Teenage best friends and rock 'n' roll upstarts Bill and Ted use a futuristic phone booth to travel through history, become part of fictional stories and enter TV shows. Wikipedia