The Sargorn are a branch species of Saurosapian; they resemble flying dinosaurs, and possess great strength and fighting prowess. Greeghan and Tskalikin are the most prominent Sargorn featured in the film, both being in the employ of Balem Abrasax.
The Sargorn were the first inhabitants of Earth over a billion years ago, with their occupancy preceding that of humans. Because the Sargorn presented a threat to Abrasax Industries' plans to seed the planet, they were eliminated via a large-scale extinction event.
Many years later, numerous Sargorn were in the employ of Balem Abrasax at the Jupiter Refinery, having developed intelligence and found employment as elite bodyguards.