Rex is an orange Tyrannosaurus Rex and the main protagonist from We're Back! A Dinosaur's Story. He likes to sing, dance, and even play golf. He is voiced by John Goodman.
Not long ago, Rex meets a little blue bird named Buster. Buster runs away to join the circus. But then Rex tells Buster that he knew a boy that ran away to join the circus. But Buster says to Rex, "Hey. ain't you a dinosaur?" Rex says, "Why yes," and told Buster that he wasn't always smart.
65,000,000 years ago Rex was a real terror chasing a small dinosaur and planning to eat it. Then a UFO hits Prehistoric Rex in the head. Then what comes out of the ufo was a small alien named Vorb. Vorb give Rex a special vitamin called Brain Grain, that's when Rex's life changed forever. Rex's personality and apperance change he also has the ablitly to talk and act as civilized and smart as a human being. Then Rex meets 3 dinosaurs: a blue Triceratops named Woog, a green Parasaurolophus named Dweeb, and a purple Pterodactyl named Elsa. Rex and the gang eat hot dogs together.
After that, they meet a wise old man from the future where all the species all the planets learn to get along. He shows the Rex and the dinosaurs his invention the Wish Radio. With it, the wise old man a.k.a. Captain Neweyes can hear what children are wishing for. Many children from the Middle Future want to see the Dinosaurs so Capt. Neweyes gives them Brian Grain, so Rex, Woog, Dweeb and Elsa can make decisons of their own. Then Capt. Neweyes shows the dinosaurs two people they should know about. One person is named Dr. Julius Bleeb. Capt. Neweyes replies that Dr. Julius knows that the dinosaurs are coming and also her address is The Museum of Natural History. The next person is Capt. Neweyes' brother Pro. Screweyes. Neweyes metioned that Screweyes is insane causing havock and chaos where ever he goes and tell the dinosaurs to stay away from his dark and unhappy brother. Then Neweyes takes the dinosaurs to the Big Apple a.k.a. New York City.
Rex and the gang arrive at the Hudson River and meet a boy named Louie after accidentally landing Louie into the water and fishing him out. Then Louie shows the dinosaurs New York City but then Rex drowns in the water! Louie saves Rex with the help of Dweeb, Elsa and Woog. Rex and Louie become friends after that. And then Louie invites Rex and the gang to the circus they all agree to go. And then they leave the harbor and head to the city. But they need to go unseen so Louie flies on Elsa and they go on a high speed flight.
Then Louie notices a girl named Cecilia Nuthatch, a lonely girl with a wealthy family but her mother was very social. And her father is always busy. Then Louie mentions that his mother is always kissing him in public so he tells Cecila that he is running away to join the circus he convinces Cecilia to go with him she says yes. Next Ceclila meets the dinosaurs and introduces herself Louie asks her, "Are you some debutante?" Cecilia smiles and says, "Why, yes, I am." Then Louie starts to have a crush on Ceclia. Then finally they go to a parade and the dinosaurs act as if they are animontronic. Then Rex begins to sing a song. But then Rex notices a purple Bronosaurus and shakes its "hand" but it was a balloon and fell to the ground. Next a little girl gets near Rex who says hi to her. But then the people find out they were real dinosaurs and panic. Then Louie and Cecilia tell the dinos that they'll meet in Central Park.
But then they find a poster saying Professor Screweyes' Eccentric Circus. Rex claims that Screweyes is the bad guy and that Louie and Cecilia are in danger and it is up to the dinosaurs so save them! Next the police surround the dinos and they flee and landed in Central Park and saw the circus. After that Louie and Cecilia go to the Eccentric Circus and meet Screweyes and a funny clown named Stubbs. Cecilia laughed at Stubbs' joke but then Screweyes asks in a angry tone, "Who laughed?!" Then Screweyes tells the kids if they wanted to sign in they would have to sign in a contract with their blood.
Then the dinosaurs are in the Circus and tell the kids to stay away from him. And Screweyes shows them his Radio, but Rex tells the kid to go with Rex and the gang. But they sign the contract so they stay there forever! But Screweyes shows a solution about the kids. Then Screweyes shows dinosaurs Brain Drain and said it will revert them back to there prehistoric selves, but the dinos refuse. Next Screweyes hypnotizes the kids and turns them into chimps! Rex tells Screweyes, "Change them back! Or I'll-" "Or you'll what?" Screweyes asks. Rex seizes and Screweyes tells the dinosaurs that they are to civilized to threatened anyone. So the dinosaurs only had two decisions. If they agree to take the Brain Drain, Screweyes will break the contract and set the kids free. If they do not agree to take the Brain Drain, then Screweyes will take the kids to the Hellzahopin to scare people. All four dinosaurs take the Brain Drain. After the children change back to normal, Rex reminds Louie to remember him. Then the kids meet Stubbs the Clown, and when he shows them his bip or joke they laughed. But Louie wonders what happened to the dinosaurs. Stubbs shows them. The kids were terrified of the dinos' prehistoric selves.
Louie and Cecilia are entered in the Circus show. Then Screweyes shows the people the Reverted dinosaurs. Screweyes tries to hypnotize Reverted Rex by using his screw eye. But then Reverted Rex was frightend by a flash and grabs Screweyes and tried to eat him. But then Louie tells Reverted Rex that he should not do it and tells him to not be a bully. Then, after Louie breaks down in tears and tells Reverted Rex to snap out of it, Reverted Rex snaps out of it and becomes the happy go lucky Rex again! The audience cheers, and Louie and Cecilia change the dinosaurs back to their civilized selves. Finally Neweyes' ship frees the dinosaurs. Next Neweyes takes the dinosaurs and the kids the ship. Screweyes meets his demise. Finally, after a long adventure, They finally make it to the Museum and fulfill the wishes of many children and Louie and Cecilia become a cute couple and reunite with their families.
And so Rex tells Buster to remember his story and never run away from his parents no matter what.
