 The Newton family from the original 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 with George Newton s brother Richard. Guess which family member it was? That s right, Beethoven! The giant mutt follows Richard Newton and his family of a nagging wife and two bratty kids as they hit the road to California in a huge, shiny - and expensive RV, equipped with a DVD player. Following them are two bumbling crooks who have hidden some secret codes on a DVD that they figure no one in the world will buy, but someone does: Richard. So now they ve got a DVD holding top secret information and the crooks must get it back...