Monty is the (former) secondary antagonist of Stuart Little and a secondary tritagonist in Stuart Little 2, Stuart Little: The Animated Series, and Stuart Little 3: Call of the Wild. He is Snowbell's friend who wanted to eat Stuart so badly, and Snowbell was afraid that he would spread word about Stuart being a member of the family. During a showdown in the trees one night, Snowbell broke one branch, sending Monty and the gang of cats into the water.
Monty is both nice and rude at times. He is known for being a blabbermouth as he always spreads word about many things, such as Stuart having a "pet cat" in the first film (which he found extremely hilarious).
- Monty is sometimes thought to be the (former) main and tertiary antagonist of Stuart Little and the tritagonist of Stuart Little 2.