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 one of the V. rexes through the mess of vines and tried to reach Ann. However, as more vines snapped, Ann fell onto one of the V. rex's jaws, to which Kong held it open with a large amount of vines. Said vines began to give way, making the one V. rex slowly drop towards another, who had its own mouth open awaiting the small prey item's descent. However, as Kong leaped down to kick its mouth shut, the former mouth was able to close, and Ann was sent falling from the action, leading to her landing on the V. rex's snout. The resulting squirming of the dinosaur resulted in the vines breaking entirely, sending both Ann and the carnivore to the forest floor.
Kong however, dealt with the former rex, seemingly killing it, before dropping down into the same area, right behind Ann. 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.