He is voiced by Steve Zahn in the first two films, by Rino Romano in the third film, and by André Sogliuzzo in the TV series.
He was one of Smokey's henchmen. He was defeated when Snowbell ripped the branch he and the other cats were on. He became a supporting protagonist in the sequel. At the end, he sees Falcon falling into the trash can, and Monty presumably eats him. Falcon returned in the 12th episode of the animated series, revealing that Falcon wasn't eaten by Monty after all.
- It was rumored that Carlos Alazraqui voiced Monty in Stuart Little: The Animated Series.
- Monty, Snowbell and Reeko are the only Stuart Little villains who reformed.
- He was bad in the first film and lazy in the sequels.