Vastatosaurus rex

Vastatosaurus rex is a fictional species of dinosaur that appears in the 2005, King Kong.

Origins
According to Peter Jackson, Vastatosaurus rex is the result of Tyrannosaurus rex evolving isolated on Skull Island over millions of years.

King Kong (2005)
While Ann Darrow was being chased by a Foetodon, a Vastatosaurus rex appeared and killed by Foetodon by crushing it with its jaws. Upon seeing Ann, the V-Rex chased after her. Ann managed to hide on a fallen tree, but a second V-Rex appeared and attacked her. Thankfully, King Kong arrived and rescued Ann. The V-Rex attacked Kong, and was soon joined by the other one. Kong took on both V-Rexes, only to find himself attacked by a third one. Kong quickly killed one V-Rex by smashing its head with a boulder. The other two V-Rexes then tackled Kong off a cliff, causing them to become tangled in vines. Kong battled the V-Rexes through the mess of vines and tried to reach Ann. Eventually, Kong grabbed Ann and got free from the vines, dropping to the ground below. One of the V-Rexes got free as well and prepared to resume the battle. Ann retreated behind Kong and allowed him to defend her. After a vicious struggle, Kong grabbed the V-Rex's jaws and pried them apart until they snapped, killing the mighty saurian.