Junior is a Tyrannosaurus fawn, that means he is not fully grown and is still learning how to hunt on his own.

Junior is the offspring of the Tyrannosaur Buck and Doe featured in "The Lost World"! This shows that the dinosaurs on Isla Sorna were a naturally breeding population.

Junior was captured by the big game hunter Roland Tembo when he was only a few weeks old but freed by Sarah Harding and Nick Van Owen.

Junior's first prey was Peter Ludlow, the CEO of Jurassic Park: San Diego at the end of the movie.