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Tyrannosaurus rex

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Tyrannosaurus rex
Creature information
Home time period Late Cretaceous period
Creature type Theropod dinosaur
Fatalities caused See full list below
Production information
Appearances Extinction Event
Picture This
Episode 5.5
Does this infobox follow the rules?

Tyrannosaurus rex, commonly abbreviated to T. rex, was a theropod dinosaur and a large predator from the Late Cretaceous, which lived in North America.


One of the largest predatory dinosaurs of all time, Tyrannosaurus was a deadly predator with a massive skull and a bite more powerful than any land animal before or after it. It was approximately four metres tall and twelve metres long, and its body was strong and muscular with a long, heavy tail, two very large and strong legs and two tiny, two-clawed forearms. Tyrannosaurus was a very resistant creature, as it took nearly a dozen direct EMD shots to knock a T. rex out. (Episode 5.5) Tyrannosaurus apparently also had a very strong metabolism, as the Baba Yaga T. rex recovered from a tranquiliser within minutes. (Extinction Event)

5x5 TyrannosaurusGettingUp

The Tyrannosaurus trying to get up. (Episode 5.5)

Tyrannosaurus was shown to hunt its prey using stealth and cunning surprising for such a large animal. (Extinction Event) However, as seen with the T. rex that appeared during Convergence, Tyrannosaurus would lose its stealth when in a panic. (Episode 5.5) Once it locked its sights on a prey item, Tyrannosaurus would pursue its victim swiftly and silently despite its large size, with little chance of escape. T. rex was so deadly that its very presence could be disturbing to some smaller animals, who would go into a state of complete silence when the predator was nearby. (Extinction Event)

Incursions and encounters

Extinction Event

At least two Tyrannosaurus came through an Anomaly to the forests of Siberia in the 20th - 21st Century, including a female referred to as Baba Yaga. The Baba Yaga T. rex wreaked havoc, killing a Torosaurus infant and eleven people in June 2008, before killing a male Tyrannosaurus which killed Medyevin.

Baby Yaga also attacked a Russian military camp and killed three of the Russian military before giving chase to Abby Maitland and Nick Cutter, who tranquilised her only for her to awake and recover within a matter of minutes. The Baba Yaga T. rex continued to live in the Siberian forests even after the forest fire.

In the Late Cretaceous, one Tyrannosaurus killed a Pachycephalosaurus directly in front of Jenny Lewis, Helen Cutter and their military escorts. Nick Cutter, Connor Temple, Abby Maitland, and a team of scientists and Russian military saw another Tyrannosaurus killing an Anatotitan in the Cretaceous.

Picture This

A Tyrannosaurus came through an Anomaly to an art gallery in the present, where it chased Jess Parker and Hilary Becker until they tricked it into going back through the Anomaly.

Episode 5.5

5x5 TyrannosaurusRampagingThroughLondon

A Tyrannosaurus rampaging through London at the start of Convergence. (Episode 5.5)

When Convergence started, a T. rex came through an Anomaly into Central London in the present and rampaged through Baker Street Plaza. It ate fleeing citizens in the streets and fatally attacked Lucy. Later, when Jenna tried to return to Lucy's body, the T. rex attacked her, but Matt Anderson drove his car right in front of it, and tripped it up for a few moments before it got back up.

Jenna hid in Matt's car as the T. rex investigated, and Matt shot it multiple times directly in its mouth with an EMD until it collapsed. Presumably, the T. rex either died from the EMD shots, was put in the ARC's Menagerie, or was returned through the Anomaly.

Other references

Episode 1.4

When Tom and Duncan were under the false impression that the Home Office was cloning Dodos, Tom mentioned in regards to why they'd choose to clone Dodos, "What would you start with, Dunc? T. rex?"

Episode 3.4

When a Giganotosaurus came through an Anomaly to an airport, Jenny Lewis initially mistook it for a T. rex before Connor Temple corrected her and dubbed it G-Rex to distinguish it.

Episode 3.10

TRex 2

The Tyrannosaurus, unconscious as a result of multiple EMD shots. (Episode 5.5)

When the ARC team arrived in a Cretaceous forest, Connor Temple mentioned Tyrannosaurus as one of the creatures possibly living in the forest.

Episode 4.1

Matt Anderson mentioned that the largest version of the EMD, when at full power, could take down a full-grown T. rex.

Episode 5.4

When Connor tried to convince Abby Maitland that the First Man-made Anomaly was not dangerous, he mentioned that it was too small for "a T. rex's toe" to pass through.


In the future, at least one Tyrannosaurus rex became caught up in Chaos, an Anomaly creature.

Deaths caused


This is a small selection of images from the massive gallery page for Tyrannosaurus rex. To the full collection of images, see here!

Real life

Tyrannosaurus rex (name meaning "king of the tyrant lizards") was a genus of coelurosaurian theropod dinosaur, which lived from about 68 to 65 million years ago in what is now western North America. It was among the last non-avian dinosaurs to exist before the K-T mass extinction event, and is believed to have been one of the most powerful terrestrial carnivores to ever live. Paleontologists have feuded over whether Tyrannosaurus was an apex predator, a scavenger, or an opportunistic combination. Over fifty T. rex fossils, some of which are almost complete, have been found.


  • Tyrannosaurus caused more deaths than any other creature in the Primeval novels. It also caused more deaths than any other dinosaur in the entire Primeval series (unless one included the twelve people the Spring-Heeled Jack Raptor killed in the initial timeline before Matt stopped it).
  • The depictions of Tyrannosaurus seen on the cover of Extinction Event and the comic Picture This are identical in appearance to its depiction in the 1993 film Jurassic Park rather than its physical appearance in Series 5.
  • Tyrannosaurus was mentioned more times than any dinosaur. In fact, T. rex has been mentioned seven times, but has only appeared three times.
  • The scene in Episode 5.5 where the T. rex tripped on Matt's car was reminiscent of a scene in Episode 3.4 where the Giganotosaurus tripped on Connor's truck while chasing him.
  • Even though Baba Yaga from Extinction Event was described as a very silent and stealthy predator, the Tyrannosaurus from Episode 5.5 was very noisy in comparison, spending most of its time stomping around and roaring. This was speculated to be because it was a panicked animal in an unfamiliar environment, whereas Baba Yaga had been living in the Siberian woods for some time and had become used to it.
  • The T. rex in Episode 5.5 was a different colour from Baba Yaga in Extinction Event. While Baba Yaga was described as black with darker black stripes, the T. rex in the show was lighter in color. It's possible that Tyrannosaurus rex exhibits melanism, like modern leopards and jaguars, in which some individuals are darker than others due to a genetic mutation.
  • The models used for Tyrannosaurus in Primeval Series 5 promos were similar to the one used in the actual show but not identical.
  • The models also used on the Primeval Series 5 DVD Back Cover (along with the Google Play store promotional image) consisted of the Tyrannosaurus model used in the show Walking With Dinosaurs, of which has many parallels with Primeval.


  • The Tyrannosaurus from Episode 5.5 was able to get up quickly after tripping. A trip like in the show would've caused greater disorientation, and possibly even killed it in real life.
  • When Matt attempted to take the T. rex down, it absorbed several shots to the head from the highest-power EMD. Matt used the same gun against a larger Spinosaurus, which was taken down in one shot. While it is possible that the EMD in Episode 5.5 was on a lower setting, it still seems unlikely, since Matt probably knew what he went up against required the highest setting.

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