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In this animated adventure, Alvin (Ross Bagdasarian), Simon (also Bagdasarian) and Theodore (Janice Karman) revel in their new gig at a movie theme park by wandering the grounds after hours. Among the attractions is the spooky Frankenstein's Castle, where a real mad scientist (Michael Bell) is bringing the monster to life. But when the boys cross paths with the creature (Frank Welker), they soon learn that appearances can be deceiving, and Frankenstein is more misunderstood than malevolent. Wikipedia