Fun is overrated! If you're gonna be a champion, I suggest you start acting like one!
~ Trenton to his son Pride after he catches him playing with Stripes.
Hey kid! See what happens when you forget your place? The racetrack is no place for a zebra. (Stripes: What'd you call me?) A zebra, which is what you are. You didn't really think you were a horse did you? (Stripes: But I am a horse. A racehorse!) You're nothing of the kind. You're lunch for a lion, and that's about it. One thing's for sure, kid. You will NEVER be a racehorse.
~ Sir Trenton revealing to Stripes that he's a zebra and insulting him.
They can't be serious! I will not allow that beast to run in my competition! (Pride: Please, Dad! Don't interfere, I can win it fair and square.) That is not a risk I'm willing to take!
~ Trenton vowing to stop Stripes from racing.

Sir Trenton is the father of Trenton's Pride, a racehorse at the Kentucky Open and the hidden secondary antagonist of Racing Stripes.

Sir Trenton is an arrogant black thoroughbred who sees his son Pride having no purpose other than to to carry on the Trenton legacy. Trenton also sees the Kentucky Open as his property and believes that Stripes might ruin it, and is willing to do whatever it takes to prevent Stripes from racing, even if he has to resort to aggression.

He was voiced by the late Fred Thompson.

Role in the film

At the fence between Nolan Walsh's farm and the racetrack, Stripes meets two young horse foals training to race, Trenton's Pride and Ruffshodd, but when they have fun racing with Stripes, Pride's father, Sir Trenton, notices and confronts the two foals. When Pride states that they were only having fun, Trenton retorts that "Fun's overrated". and that he has to start acting like champion. Trenton then forbids the two foals from playing with Stripes again.

Years later, Trenton sees adult Pride & Ruffshodd chatting with Stripes, and tells Stripes "Stop bothering my son." Ruffshodd claims that he and Pride were trying get Stripes to stop bothering them, but Trenton won't buy it. He then leaves.

Later at the Kentucky practice, Trenton tells Stripes that he is a zebra, not a racehorse. Trenton then tells Stripes that he will never be a racehorse and leaves. Stripes is discouraged by this revelation. But his friends help him overcome it. When Shetland Pony, Tucker (who had trained Trenton without getting any thanks from him) states that he is in for a huge surprise, Trenton scoffs "You'll NEVER beat a Trenton."

When Trenton hears that Stripes has been signed in to race, he is furious and is willing to stop him. When Pride insists that he can win the race fair and square, Trenton blows him off, stating that he is unwilling to take that risk.

On the night before the race, Sir Trenton and several other thoroughbred (excluding Pride) ambush Stripes on his date with racing jumper Sandy. Trenton then kidnaps Sandy and threatening to hurt her if he races, and then knocks Stripes unconscious.

At his shed at the racetrack, Trenton has forced Sandy into her own stable. Trenton instructs Pride to win the race, at all cost, with Pride stating he'll do his best. While Trenton listens to his Mozart. Goose the Pelican, Franny the Goat and Tucker the pony then arrive at the stables to save Sandy, thinking of a way to distract him. Goose tries to defecate on him, but misses and instead crashes into a wall, causing a bucket to fall on his head and at Sir Trenton's mercy.

Before Trenton can finish Goose off, Buzz and Scuzz distract the racer by luring him into his own stable, and locking him inside of it. Tucker and Franny free Sandy. As the furious Sir Trenton watches them leave he bangs his hooves on his stable door. Trenton manages to escape and he follows the group to the fence at Nolan's farm. Trenton furiously states to Stripes that "The affections of a filly" don't make him a race horse. Stripes retorts that he doesn't want to be a race horse, he's a zebra going to the big race. Trenton watches them leave for the racetrack with a cold look on his face. But then said, "You runts don't know what you're in for." meaning that he's a little bit worried about what will happen.

Sir Trenton is not seen again in the film, and it is unknown how he reacted when Stripes won the race at the film's end.