The Unnamed Alley Cat is an antagonist in Stuart Little. He is one of the minions of Smokey. He is the only cat in the film that doesn't speak and is a grey longhaired cat.
The Unnamed Alley Cat is for some strange reason the only cat in the film that doesn't speak and it isn't really explained in the story. However, his persona is similar to Smokey's, cruel, ruthless and hungry for mice.