Tyrannosaurus rex

Tyrannosaurus rex (ティラノサウルス·レックス, Tiranosaurusu rekkusu) was a large carnivorous dinosaur from the late Cretaceous period. A tyrannosaurus rex famously appeared in the 1933 film King Kong, and one also appeared in Rebirth of Mothra III in 1998.

King Kong
A tyrannosaurus was among the prehistoric creatures living on Skull Island in 1933, when the crew of the Venture arrived on the island. While King Kong was trying to fend off a rescue party in search of his "bride," Ann Darrow, the T-Rex attempted to eat Ann. Kong heard Ann's screams and rushed to save her, battling the T-Rex in a vicious struggle. Eventually, Kong gained the upper hand and pried the creature's jaws apart, snapping them and killing the T-Rex.

Rebirth of Mothra III
A Tyrannosaurus appeared to hunts a herd of Triceratops. It attempted to kill one of the horned dinosaurs but became a victim of Cretaceous King Ghidorah, which dropped the dinosaur from his grasp when Mothra Leo arrived. A T-Rex and a Triceratops later witnessed the severed tail of Ghidorah burrow underground after he was defeated by Leo.

Trivia

 * The tyrannosaurus rex in King Kong is inaccurately depicted with three fingers on each hand. This is because at the time, it was unknown exactly how many fingers tyrannosaurus had, and it wasn't until later it was discovered that it only possessed two digits on each hand.
 * As a tribute to the T-Rex in the original King Kong, the V-rexes in the 2005 remake possess three fingers as well.
 * Godzilla's appearance was loosely based on contemporary depictions of tyrannosaurus rex, along with the characteristics of other dinosaurs like stegosaurus.
 * According to an interview with special effects designer Shinji Nishikawa, in the film Godzilla vs. King Ghidorah Godzilla originally was to be revealed to have been a tyrannosaurus rex prior to being mutated by radiation. However, Godzilla was later changed to a Godzillasaurus that was mutated instead.
 * In the 2005 version of King Kong, instead of a tyrannosaurus rex, three similar dinosaurs called Vastatosaurus rex, or "V-rex," appear. According to Peter Jackson, V-rex is the result of tyrannosaurus rex living isolated on Skull Island and evolving over a period of millions of years.