Tyrannosaurus rex

Tyrannosaurus rex was one of the most famous dinosaurs on Earth. They lived towards the end of the Cretaceous period. It was still one of the largest and most dangerous known land predators. (TV: Invasion of the Dinosaurs)

Biology
to be added

Encounters
During Operation Golden Age, Tyrannosaurus rex was one of the dinosaurs that was brought into the present. The T. rex were one of the most dangerous creatures encountered by the UNIT troops. Though not very intelligent, they seemed to be bullet-proof and could only be scared away with grenades. One was even shown breaking through a wall. These T. rexes were large, ponderous creatures with short legs, lumpy features and a thick tail. The Doctor encountered at least three T. rexes and captured one in order to find out where (or when) they came from. (TV: Invasion of the Dinosaurs)

The Rani had several Tyrannosaurus rex embryos in her collection. These embryos were accidentally released after the Rani's TARDIS was sabotaged by the the Sixth Doctor. Due to time spillage, these embryos then quickly grew into a greener, sleeker example of T. rex than those later encountered by the Doctor. (TV: The Mark of the Rani)



In an alternate timeline, Tyrannosaurus rex was one of the creatures bought back from extinction by the Silurians and were possibly used for mounts. (PROSE: Blood Heat)

The Tenth Doctor and Martha Jones encountered a T. rex in prehistoric Earth. The Doctor later brought one to 2008 to fight the Cybermen. The T. rex destroyed all of the Cybermen. (PROSE: Made of Steel)

Tyrannosaurus rex was among the dinosaurs farmed by the Sanctified Empire. The Sanctified sent one T. rex to Cardiff in 2008 with a Harrowkind and several other dinosaurs to try and stop Vox. But Vox used the absorbed power of the Cardiff Space-Time Rift to obliterate the T. rex. (COMIC: Rift War!)

Several Tyrannosaurus rex were brought into Sydney Australia in 2010 by a chronal wave. They wreaked havoc in the city, then presumably died for freezing temperatures when another chronal wave brought the Ice Age into Sydney. (COMIC: The Age of Ice)

Tyrannosaurus rex was among the specimens placed aboard the Silurian Ark by the Silurians to repopulate the Earth with once the incorrectly predicted catastrophe passed. When the Eleventh Doctor and his companions arrived on the Ark in 2367, they found a T. rex nest and a sleeping juvenile. The T. rex specimens were most likely sent to Siluria by the Doctor after he stopped the Ark from returning to Earth. (TV: Dinosaurs on a Spaceship)

A zoo on an unnamed planet exhibited a Tyrannosaurus rex or a tyrannosaurus-like creature. (COMIC: The Didus Expedition)

A Tyrannosaurus rex was transported to an alternative Death Zone on Gallifrey, where it proceeded to kill several Daleks before itself being exterminated. (AUDIO: The Five Companions)

A robotic Tyrannosaurus named Kevin briefly joined the Eleventh Doctor as a companion, although his size and appearance caused complications. (COMIC: When Worlds Collide, COMIC: Your Destiny Awaits, COMIC: Space Squid)

Behind the scenes
According to non-narrative material in DWBIT 7, Tyrannosaurs were also native to the planet Raxas, and along with the other Raxas dinosaurs, proved to be more than a match for a Dalek attack. They were so strong they could bite the Dalek's dalekanium casings in half and crush at least four Daleks with their massive feet.