Warren T. Cat

Warren T. Cat (also known as his false name Warren T. Rat) is the main antagonist of the 1986 Don Bluth animated film An American Tail. He is a cat who is the leader of Mott Street Maulers, a gang of dangerous cats who terrorize the mice in New York and killed them or use them as slaves and prisoners. He is also Fievel's first arch-enemy.

He is voiced by the late John Finnegan.

An American Tail
Warren is first seen counting money in a human suitcase. His cockroach accountant, Digit, complains about his smoking habits. Warren, not caring in slightest, suggests that he could fire him; Digit however seems to enjoy the idea, being extremely unhappy of his work conditions. After Digit counts his money, Warren T. finds out that he had 50 cents less than yesterday, which upsets him since he hates to lose money. When Fievel lands into Warren T. Rat's business area, Digit tells Warren that Moe, an friend can always use an extra kid 50c a day. Warren T. Rat then introduces himself to Fievel by pretending to be nice to him and also lying to him that he knows where his family is at as well as falsely promising to help find his family.

Later, Warren takes Fievel to Moe's sweatshop, lying to Fievel that his family is there and Moe grab him and also use him as a worker and a slave. When Fievel asks him about his family, Warren tells him he doesn't need a family now that he's got a job before slamming the door on his way out.

He is later mentioned by Honest John where it's revealed that Warren is extorting money from the other mice for protection from the cats that he never provides. This foreshadows what the audience discover later during the movie.

Warren isn't seen again until later in the movie where Fievel runs into him in the the Mott Street Mauler's hideout thinking that was his father where he is poorly playing his violin (due to his nose getting in the way), Digit then tells him that he could stop playing it. Warren says that's funny and he never know a cockroach with good taste (showing that he is threating Digit to eat him). after Warren removed his false nose and ears, Fievel discovers that Warren is actually a cat, When the rat-disguised cat sees Fievel in a mirror, he tells him how did get in his hideout and also tries to get him but Fievel bites him and almost escape but his minions capture him, locking him a bird cage and sends Tiger to guard him but however, Fievel with the help of Tiger (who actually like mice and is a nice cat) which caused him to be fired (which he finds that a good thing since he never likes Warren).

Warren, disguising himself as a rat again, chasing Fievel along with his cat gang down to Chelsea Pier. Once there, he tries to negotiate peace with the mice by demanding all of their money and they hand over Fievel. When orders Gussie to hand over Fievel once again, Tony uses his slingshot through Warren's disguise which would reveal that he is a cat and all the mice throw various objects at him, Warren then tries to kill them by setting Chelsea Pier on fire but the mice's secret weapon (The Giant Mouse of Minsak) chases the cats which would cause them to go on the ship which will go to Hong-Kong.

Personality
Warren is greedy, deceitful, manipulative, and sadistic who cares about money by killing mice and use them as slaves. He also hates mice since he said so himself.