The Gorgosaurus is actually archive footage of the Albertosaurus from the series finale of Primeval: New World (2012), which was made available to fans for use in their own fan films. The animal's roars come from the Allosaurus roars in BBC's Allosaurus: A Walking with Dinosaurs Special (2000). The creator wanted to use the animation and sounds to create effects for a different dinosaur from either production, and Albertosaurus is a closely related descendant to Gorgosaurus.