A gigantic dinosaur resembling a Tyrannosaurus Rex, Gorosaurus was first discovered on Mondo Island when he attacked Susan Watson, one of the UN submarine members who was sent to investigate the tiny isle. King Kong awoke and fought the ferocious reptile. It looked as though Gorosaurus was going to win, as he was able to knock King Kong over several times with his kangaroo kick. It was a devastating attack where the athletic animal would lean back on his tail and kick at his foe. Gorosaurus' luck would soon fail, however, when King Kong snapped his jaw. The injured dinosaur lay motionless on the ground, and seemed to be dead. He managed to hold on and recover, however, and soon sought a new home.

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