Tyrannosaurus rex

Tyrannosaurus Rex is a species of predatory theropod dinosaur that lived in the Late Cretaceous Period around 65 million years ago. It appeared as the main antagonist in the Rite of Spring segment of Disney's 1940 hybrid film Fantasia.

Physical appearance
The Tyrannosaurus was protrayed as a huge blue dinosaur with a big square head an a mouth full of long, railroad spike-like teeth. The one in Fantasia is incorrectly shown with three fingers, while the actual dinosaur only had 2. Walt Disney himself knew that the real Tyrannosaurus had only 2 fingers, but thought a 3-fingered protrayal would look scarier.

Fantasia
The Tyrannosaurus makes his first appearance as he attacks the dinosaurs of the lowlands. They all stare in horror in his general direction as rain begins to fall and lightning crackles when the massive theropod enters the scene. They immediately continue to retreat in fear as the Tyrannosaurus marches foreward, snapping his jaws at anything that moves. While many of the smaller dinosaurs are able to retreat out of the hungry theropod's path, the Stegosaurus is unable to move away fast enough and is quickly targeted. The Tyrannosaurus latches his brawany jaws around the Stegosaurus' tail just above the spikes, dragging his heels into the mud and bringing the lumbering dinosaur's retreat to a suspensful haul. The Stegosaurus faces his attacker who roars violently and quickly goes for the neck with his thick square jaws. In defense, the Stegosaurus lashes out with his spiked tail, trying desperately to keep the hungry theropod at bay. After a few brief lashouts and defensive volleys by the two titans, they begin to slowly sidestep each other. A short yet vicious battle follows and the Stegosaurus is quickly unable to stay on his feet as the Tyrannosaurus time and time against goes for the neck, fighting hard against the defending tail spikes of his prey. With the battle won and his prey fallen, the Tyrannosaurus lets out a mighty roars in victory as the other dinosaurs watch. With the struggle over and the predator satisfied, the other dinosaurs return to their buisness as the Tyrannosaurus gorges on his prize.

Near the end of the segment, supposedly the same Tyrannosaurus makes another apearance just before he dies. The once mighty ruler of the Creatceous succombs to mass dehydration as the Earth's climate changes, visibly collapsing into the sand. Other dinosaurs, incluidng a Parasaurolophus and a Ceratosaurus, pass the corpse and continue on into the hazed distance, a path that leads to nowhere but their own extinction.

He also makes a cameo in the sequel Fantasia 2000 in a flashback from the original film.

The Little Mermaid (TV series)
In the episode "Land of Dinosaurs", Ariel finds frozen dinosaurs during a trip to the North Pole and she thaws them with her father's trident. King Triton makes a refuge for them on land after some dinosaurs cause chaos. A T- Rex was among the species of dinosaurs that were causing havoc.

Aladdin (TV series)
A T- Rex served as main antagonist in the episode Much Abu About Something.

The Legend of Tarzan
A female T-Rex appeared in an episode of "The Legend of Tarzan", who attacked Tarzan, Jane, Samuel T. Philander, and Professor Porter after the latter stole her egg.

Lady and the Tramp II: Scamp's Adventure
Scamp discovers a Tyrannosaurus skeleton. Whether this is the same specimen or a completely different one is unknown.

Phineas and Ferb
A brown Tyrannosaurus Rex was the main antagonist in the episode "It's About Time!". When Phineas, Ferb and Candace were trapped in the mesozoic era a T-Rex chased them. They eventually lost it, but it found them again. When they were back in the present at the museum the T-Rex accidentally came with them. It tried to attack Candace but Doofenshmirtz's Freezeanator hit it and froze it. When the T-Rex is chasing Candace, the theme from the tyrannosaurus rex Grumpy from the 1970s television show Land of the Lost can be heard.It made a cameo in "Mom's Birthday" from a flashback. The Tyrannosaurus makes cameos again in "Unfair Science Fair Redux (Another Story)" and "Phineas and Ferb's Quantum Boogaloo".

Disney Parks
Tyrannosaurus Rex is seen as The Disneyland train travels to the Primeval World diorama. In it, it is seen reenacting his battle from Fantasia.

In Walt Disney World's Epcot there is a ride known as Ellen's Energy Adventure staring Ellen DeGeneres and Bill Nye the Science Guy, who explore the world of energy, including the use of fossil fuels. During the ride, Bill Nye brings DeGeneres "back in time" to the age of dinosaurs to explain the origin of fossil fuels. During this portion of the ride, severl dinosaurs can be seen that are similar to the ones during Fantasia's The Rite of Spring. Most notably, there is a large Tyrannosaurus attacking a Stegosaurus over a cliff. This is obviously in reference to Fantasia.

In real life
In real life, Tyrannosaurus rex was a genus of coelurosaurian theropod dinosaur that lived in the Maastarichtian stage of the Late Cretaceous Period, about 68-65 million years ago. Thus, it did not coexist with any species of Stegosaurus, which lived in the Tithonian stage of the Late Jurassic Period, from 150-145 million years ago. This puts a gap between the two species that is lager than the one that separates Tyrannosaurus rex from us! Unlike in Fantasia, Tyrannosaurus rex did not have three fingers; it only had two. Why it was protrayed with such an inaccuracy is because Walt Disney reported to Barnum Brown, the discoverer of Tyrannosaurus rex, that it looked scarier that way.

Trivia

 * During the production of DINOSAUR, then called Countdown to Extinction, original plans called for Tyrannosaurus Rex, but Disney decided to incorporate the then newly discovered Carnotaurus instead. Also, in the original story for Dinosaur conceived and pitched by Phil Tippett and Paul Verhoeven in 1988, the main antagonist was going to be a Tyrannosaurus.