Stegosaurus-header-icon "'Ooh, ah,' that's how it always starts. But then later there's running and screaming."

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"We have a T. rex."
John Hammond(src)

The Tyrannosaurus rex of the film version of Jurassic Park is nicknamed Roberta in Phil Tippett's storyboards for the first film [1], but most fans call her by her novel and Jurassic Park: The Game nickname Rexy/Rexie. She is a female Tyrannosaurus that appears in Jurassic Park, Jurassic World, and Jurassic World: Fallen Kingdom. She is known for participating in several incidents on Isla Nublar and for saving the major human participants involved in these incidents from other dangerous creatures, although inadvertently. This makes her role something of an anti-heroine in the films.

Behavioral characteristics

This T. rex is the largest carnivore living on Isla Nublar; as such, she is a fearless, bold, and domineering beast that walks the line between heroine and villainess, largely motivated by two goals: Keep intruders off her territory and eat any prey she finds there. Even twenty-plus years older, she was still relentless, launching herself at the Indominus rex the moment she saw it.

In many circumstances, her own hunger and hostility was indirectly helpful to others, such as her feeding on the Velociraptors chasing Alan Grant, Ellie Sattler, Lex Murphy, and Tim Murphy and thus indirectly saving them. Additionally, her brawn and ferocity is partnered with a good dose of intelligence, as she checked her fence to see if it was working, knew not to attack Blue during the battle with the Indominus, and sparing Blue because she was too tired to fight as well as acknowledging the smaller theropod's help.



The T. rex was hatched in 1988[2]  inside the InGen Compound[3] of Isla Sorna[4][3] where she spent the first year of her life inside the lab being taken care of by its workers[4] before being transported to Isla Nublar to live in the Tyrannosaur Paddock as an attraction for InGen's Jurassic Park.[5]'s map of Isla Nublar states that her paddock was designed to house a juvenile of her species to live with her,[6] but no juvenile was ever transported to the paddock.[2]

Isla Nublar Incident (1993)

"Boy, do I hate being right all the time."
Ian Malcolm after the T. rex escapes(src)

When the inspection team constituting of vertebrate paleontologist Dr. Alan Grant, paleobotanist Dr. Ellie Sattler, chaotician Dr. Ian Malcolm, lawyer Donald Gennaro, and John Hammond's grandchildren Lex and Tim Murphy took a tour of Jurassic Park, the Tyrannosaurus was initially a no-show. Although computer technician Ray Arnold attempted to lure her to her paddock fence by tantalizing her with a goat, however, the T. rex still refused to answer the call. Alan, observing this, surmised that it was because she wanted to hunt her prey rather than have it offered to her.[5]


The T. rex roars as she becomes free from her paddock.

Later that night, a tropical storm forced the tour to be turned around sometime after the group visited the Triceratops Paddock. Unfortunately, due to Dennis Nedry's messing with the park's computer systems, the Ford Explorer Tour Vehicles were shut down in front of the T. rex's paddock with its electrified fencing in the same state. At this point, the T. rex revealed herself to the visitors by eating the goat left by the fence as bait, her hunger probably having eclipsing her pride. Gennaro, in a fit of panic, left his Explorer and ran to the nearby restroom hut to hide. By that point, the T. rex moved to the disabled fence and ripped it apart with her teeth before stepping out onto the road and roaring triumphantly. After a minute or two of exploring and investigating the Explorers, her attention was aroused by the light that was emitted from a flashlight that Lex had turned on in the front Explorer. Unaware that the source of the light was inside the Explorer, she walked right to the front door and peered out into the jungle in front of the Explorer. It was not until Tim slammed the open door next to the T. rex shut that she had discovered the source of the light.

Now confident that the light was coming from inside the Explorer and that there were interesting objects inside, the T. rex set to attacking the mysterious vehicle in front of her, searching for a way to get at Lex and Tim to eat them. After failing to get at them through the Explorer's skylight, she flipped the car over and proceeded to savage the undercarriage and right rear tire whilst crushing it under her massive foot. Thanks to the heroic efforts of Alan and Ian, the T. rex was briefly distracted. She followed Ian as he fled toward the Tyrannosaur Paddock Bathroom, where she injured the mathematician by flinging him into the air just as her head came crashing through the door, causing Ian to be buried in the wreckage. The destruction of the building revealed the cowering Gennaro, whom she proceeded to devour while Alan rescued the kids inside the car. Before long, however, the T. rex returned and pushed the vehicle over the cliff while Tim was still inside and pushing Lex and Alan off the edge with the car, though the three survived.[5]

As Robert Muldoon and Ellie were in the Tyrannosaur Paddock investigating the whereabouts of the survivors and had found Ian, the T. rex attacked the search party. Muldoon and Ellie had heard the T. rex roar several times before during the search and just before her ambush, Ian heard her footsteps. The T. rex attacked suddenly, without warning, crashing through a line of trees where she began chasing them through a tree lined corridor. After a very close chase, she was unsuccessful in catching them and so finally gave up, letting the trio escape to the Visitor Center.[5]


The T. rex killing a Gallimus as Dr. Grant and the Murphys watch.

The next day, during Alan, Tim, and Lex's continued trek to the Visitor Center, they found themselves in the Gallimimus Enclosure, where they witnessed a stampeding herd of Gallimimus. They ran alongside the dinosaurs momentarily before hiding behind a fallen log and watched as the herd was suddenly ambushed by the T. rex who came roaring out of the bushes in their path, stumbling a Gallimimus. This Gallimimus tried to run away, but was too slow to react, and the Tyrannosaur lunged at it, catching the dinosaur in her jaws before proceeding to shake the Gallimimus to death. Alan, Lex, and Tim watched in amazement as the T. rex started to feast on the carcass. Lex begged Alan for them to go, to which Alan obliged. However, Tim continued to stare in fascination and so had to be forcibly taken away by Alan.[5] She never fully consumed this Gallimimus and its remains were still present in the location where it had died by October 6, 2002, over a decade later.[7]


The T. rex roaring after killing the raptors inside the Visitor Center.

The T. rex later made her way to the Visitor Center, entering the lobby through the uncompleted side and grabbed a Velociraptor from mid-air just as it was to pounce on Alan, Ellie, Tim, and Lex, then crushed it in her jaws. Using the distraction that she provided, the humans fled. Meanwhile, another raptor, the Big One pounced on the larger theropod. She snapped at her but could not reach her as the raptor continued to rip and tear madly. Rolling her head, the Big One fell into the T. rex's mouth where she was killed and then thrown against the Tyrannosaurus skeleton, bringing it down with a crash. Having conquered her prey, the T. rex let out a mighty bellow in triumph as the "When Dinosaurs Ruled the Earth" sign fell to the ground.[5]

In the aftermath of the incident, the T. rex went wild and lived on Isla Nublar for about a decade,[8][9] surviving off of Gallimimus, Parasaurolophus, abandoned goat herds, and carrion (notably the corpse of a Triceratops that had died earlier), as well as attempting to hunt the Brachiosaurus. During this time, she had also developed a particularity severe case of ragged tooth.

Jurassic World

Rexy Jurassic World

The T. rex living in the T. rex Kingdom.

According to the Masrani backdoor, during the construction of Jurassic World, Vic Hoskins and his team of InGen Security Division troopers encountered the T. rex on April 19, 2002.[10]

Sometime later or during the encounter with InGen Security, the T. rex was captured and put back into captivity where she lived in the T. rex Kingdom attraction of the dinosaur park.[11][9] She was still fed goats like before, but to bring her out, a flare would be thrown to get her attention. She served as one of the most popular attractions, particularly at feeding time.[12]

Isla Nublar Incident (2015)

"We need more teeth!"
Gray Mitchell to Claire Dearing as the Indominus rex overpowers the Velociraptor pack, prompting her to release the T. rex.(src)
Indominus VS T. rex

The T. rex faces off with an Indominus rex in Main Street.

The T. rex mainly stayed in her paddock for most of the incident until Claire Dearing told Lowery Cruthers to open her enclosure's door after Claire's nephew Gray Mitchell told her that another dinosaur was needed to help kill the Indominus rex. Using a flare, Claire guided the T. rex to the Indominus and threw the flare at the hybrid. Crashing through Main Street's mounted Spinosaurus skeleton, the Tyrannosaur challenged the I. rex with an almighty bellow, not knowing exactly what this new creature was but identifying it as a threat. When the hybrid did not back down, the T. rex attacked her viciously.

Jurassic world the battle for isla nublar by tyrannuss555-d8x8n2m

Blue and the T. rex cornering an I. rex before she is killed by the Jurassic World's Mosasaurus.

Initially, the tyrannosaur had the advantage, landing several bites to the I. rex's neck, but after being able to claw her viciously with its huge arms, the tables were quickly turned, with the T. rex thrown down against the Jurassic Traders Outpost, destroying it in the process and almost killing Owen Grady, Gray, and Zach Mitchell.[12]

Jurassic World Rexy 2

The T. rex roaring after the 2015 Isla Nublar Incident

However, before the Indominus could kill her, Blue, the surviving Velociraptor of the battle, intervened by lunging onto the I. rex, giving the T. rex time to get up off the ground. With Blue latched onto the hybrid, the old T. rex grabbed the Indominus dragging her and slamming her body into the nearby buildings of Main Street. At one point, Blue rode on the tyrannosaur's back while she smashed the I. rex into one of the buildings. She finally flung the hybrid near the edge of the Jurassic World Lagoon where the Mosasaurus that resided there leaped out of the water to snatch the I. rex and drag it underwater, drowning the hybrid. After the fight, the T. rex and Blue looked at each other for a moment. Despite previous animosity with raptors, the T. rex decided to spare Blue because she saved her life, limping away to recover.[12]

In the aftermath of the incident, the T. rex stomped onto the Control Center helipad and took in the ruined park that had become void of any people, warming her wounds in the rising sun before letting out her signature roar, claiming the island as hers once again.[12]

Jurassic World: Fallen Kingdom

"I think there's one onboard."
Zia Rodriguez talking her needing the T. rex to save Blue's life(src)
Screenshot 2017-12-07 at 6.16.54 PM

The T. rex stepping on a Carnotaurus

Three years after the incident at Jurassic World, the T. rex continued to run wild on the island with other surviving dinosaurs. One stormy night, a group of mercenaries was on Isla Nublar to retrieve a bone sample from the I. rex's remains at the bottom of the park's lagoon, which also still housed its surviving Mosasaurus. As they prepared to pick up one of their men, the T. rex entered their campsite located in the ruins of Main Street and proceeded to chase him, stepping on the tablet that controlled the gate which connected the lagoon to the ocean in the process. The T. rex chased the man towards the edge of the lagoon, but he got away by climbing onto the helicopter's ladder. Despite grabbing the ladder with her jaws and using her strength to pull her potential prey to her, the mercenaries got away, and the T. rex was left roaring into the night.

During the destruction of the island by the eruption of Mount Sibo, Owen and his group encountered her again, after she had inadvertently saved them from an attacking Carnotaurus. She later left the dead Carnotaurus behind as the volcano erupted, with the shockwave from the eruption prompting her to flee the scene, followed by the other dinosaurs that caused a stampede. She and the other dinosaurs were later captured by another team of mercenaries led by Ken Wheatley, who loaded them on to their cargo ship, the Arcadia, and took them to the Lockwood Manor as Isla Nublar burned.

Sometime later on, Owen and Claire found her sedated in a truck, where they needed to get some of her blood for transfusion for Blue, who had been shot awhile back by one of Wheatley's mercenaries. As they got some of her blood, Claire rode on the theropod’s back while trying to hand the blood bag to Owen. After being locked in by one of the mercenaries, Owen looked into the tyrannosaur's eye as she awoke from her sedation. Finding herself in an enclosed space with people around her, the mighty theropod started to freak out and broke free of her restraints, with Owen being forced to jump through her snapping jaws to get out of the truck.

993d8402-1a7f-404b-8bde-8223a82b2483 (2)

The T. rex roaring at a lion after being freed from Lockwood Manor

Later, the T. rex was lured to her cell located beneath the Lockwood estate with a goat in order have her prepared to be sold off to wealthy buyers in an auction set up by Eli Mills and Gunnar Eversol. However, some poisonous gas was released into the holding cell during Blue's brawl with some mercenaries, threatening to kill the dinosaurs yet again. The T. rex was eventually freed along with the other dinosaurs through Claire opening all the cell doors and Maisie, who had just lost her grandfather and learned of her true origin, opening the gate that set them all free and escape the manor. Before she left the premises, however, the T. rex killed and ate Mills after scaring off a Carnotaurus that had tried to join the feast. Finishing off what little remained of Mills, the T. rex then brought one of her massive feet down on the I. rex's only surviving bone fragment and DNA sample as she stomped off into the woods, crushing it to smithereens and with it any chance of other hybrids returning. After she escaped, the T. rex broke into a nearby zoo and roared at an African lion, who stood his ground by angrily roaring back at her.




Behind the scenes

see Jurassic Park Tyrannosaurus rex Animatronics

Like its novel counterpart, the T. rex was supposed to die in the Jurassic Park film, but this was changed.[13]

The T. rex's animatronic in Jurassic Park would occasionally malfunction in the rain.

The original ending to Jurassic Park did not feature the T. rex's involvement at all. The Velociraptor pack would have been killed by the two mounted skeletons inside the Visitor Center, one being impaled by a rib of one of the skeleton as it collapsed and the other by Dr. Grant taking control of a crane where he moved the second raptor into the jaws of the T. rex skeleton where it would become crushed by its jaws.[14][15] Another scrapped ending was that only one of the raptors was to be killed by one of the skeletons falling on it while the remaining raptor was shot by John Hammond.[16] Director Steven Spielberg scrapped these endings because he realized that Tyrannosaurus rex was one of the stars of the film only rivaled by Velociraptor.[14] This ending was further prompted by the success Industrial Light and Magic had from the CGI model of the T. rex.[15]


T. rex crashing through the Spinosaurus skeleton.

A Jurassic World sight gag is shown where the T. rex destroyed the Main Street's Spinosaurus skeleton to kill the Indominus, referencing the fight in Jurassic Park III where a Spinosaurus killed a T. rex and the scene's backlash.

In Jurassic World, the T. rex sounds like the Tyrannosaur Buck from The Lost World: Jurassic Park instead of her sounds from Jurassic Park. It's possible that the filmmakers wanted it to sound older, as she lived from the 1993 Isla Nublar Incident, which was 22 years before. However, her original roar from Jurassic Park did not go unused. She issued her original call twice during her battle with the Indominus.[citation needed] However, in Jurassic World: Fallen Kingdom, a deeper pitched variant of her original roar from Jurassic Park is used, likely for the same reason as in Jurassic World.

During the opening scene in Jurassic World: Fallen Kingdom, a flash of lightning illuminated the head of the T. rex as she is stalking the mercenaries' campsite. This is influenced by the Jurassic Park chapter "The Main Road", where the T. rex makes her appearance to the visitors in a similar manner following the power outage, which the first film would later adapt.

After she kills Mills in Jurassic World: Fallen Kingdom, the T. rex stands in a pose that seems to be a flipped image of her standing pose that the end of Jurassic Park.

The T. rex also appears as a cameo in another Spielberg movie, Ready Player One. She acts as a challenge on the racetrack near the beginning of the movie, attacking drivers alongside various obstacles and King Kong.

Jurassic World's Tyrannosaurus can be seen in Jurassic World: The Ride, roaring at the Indominus rex and the boat tour right before the 80-foot drop. In a queue video[17] for the ride, Owen states that she is over 20 feet tall, 40 feet long, weighs 30,000 pounds, and Claire states she has a bite force of over 12,000 pounds. The weight of the animal conflicts with a different queue video where she is said to weigh only 10,000 pounds.[18]

Notes and references

  1. Robertarex
  2. 2.0 2.1 Dinosaur Protection Group
  3. 3.0 3.1 Jurassic Park III
  4. 4.0 4.1 The Lost World: Jurassic Park
  5. 5.0 5.1 5.2 5.3 5.4 5.5 Jurassic Park
  6. Trexpaddockoldjw
  7. Timack Image from the Masrani backdoor.
  9. 9.0 9.1 Jurassic World director Colin Trevorrow as well as Industrial Light and Magic members Geoff Campbell and Steve Jubinville have stated that the T. rex from Jurassic World was indeed the same individual that appeared in Jurassic Park.
  10. In the archived message "WEEK 3" of the Masrani backdoor Vic Hoskins writes about "staring a seven-ton predator in the eyes" in the first year of construction of Jurassic World, in which InGen Security was on Isla Nublar to defend the construction workers there. The only predator known on Isla Nublar that reaches this weight is Tyrannosaurus and since there was no other T. rex confirmed to have been on the island at the time of the 1993 Isla Nublar Incident the creature encountered by Hoskins was the t. rex.
  11. Cite error: Invalid <ref> tag; no text was provided for refs named
  12. 12.0 12.1 12.2 12.3 Jurassic World
  13. Nerdist Podcast - Episode 772: Kathleen Kennedy (December 16, 2015) Retrieved from
  14. 14.0 14.1 Return to Jurassic Park: Making Prehistory
  15. 15.0 15.1 (Shay, Duncan) The Making of Jurassic Park, p. 118.
  16. Sharpio, Mark. (1993, August) In the Shadow of the Dinosaurs. Fangoria, 27. Retrieved from
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