A tale of two Korean American cousins. A shy young law student, hungry for a more vivid, risk-taking existence, visits his playboy cousin in New York City. In his quest to emulate his cousin, the law student sheds his old identity...

The family is pleasantly surprised and puzzled when Beethoven suddenly becomes obedient. Turns out it's a prince and the pauper scenario, with the real Beethoven now living with a pompous rich family.

The Newton family from the first two Beethoven movies are on vacation in Europe, but do plan to join a Newton family reunion, and to make sure one of their family members definitely makes it, they ship him to travel to the reunion...