Flashback: Alvin and the Chipmunks Meet The Universal Monsters
The one-two punch of 1999’s Alvin and the Chipmunks Meet Frankenstein and 2000’s Alvin and the Chipmunks Meet the Wolfman were co-productions of Bagdasarian Productions and Universal Cartoon Studios. They were animated overseas by Tama Productions in Tokyo, Japan.
Alvin and the Chipmunks Meet Frankenstein - Trailer
Alvin and the Chipmunks Meet the Wolfman - Trailer
Buy the double feature on Amazon (affiliate link)