The Chipmunks work in an amusement park attraction. After Alvin drives a crazy tour group, they miss their next performance and are locked in the park after closing time. Little do they know that the real Dr. Frankenstein has been hired in a new attraction called, "Frankenstein's Castle"; figuring that the castle isn't scary enough, the mad scientist recreates the real Monster.
Ross Bagdasarian, Jr.
as Alvin Seville / Simon Seville / Dave Seville (voice)
Dee Bradley Baker
as Tour Guide (voice)
Michael Bell
as Dr. Frankenstein (voice)
Mary Kay Bergman
as Mother (voice)
Janice Karman
as Theodore Seville (voice)
Jim Meskimen
as Mr. Yesman (voice)
Kevin Michael Richardson
as Bud Wiley (voice)
Frank Welker
as The Monster (voice)
