Oscar Morales was a mercenary hired by InGen to extract survivors from Isla Nublar following the Jurassic Park Incident, and was one of Billy Yoder‘s teammates. He was also one of the native inhabitants of Isla Nublar who was displaced after InGen leased the island. He and Nima knew each other prior to their encounter in Jurassic Park. He single-handedly killed a Velociraptor in hand-to-claw combat in the service tunnels at Dr. Laura Sorkin‘s outpost and wounded another–the pack’s leader–with a knife.
After averting an explosion in the Park’s geothermal power plant, the survivors found that the controls with which they could escape from the plant were burned out, and the only other controls were on the next level down, now “protected” by the raptors. Oscar volunteered to get to the controls so that the others could escape, but was killed by the raptor to which he wounded earlier.
Little is known about Oscar’s past after he was displaced from Isla Nublar, although it is hinted by Billy Yoder throughout the game that they have known each other for several years. He has a large amount of skulls on his arms hinting at a large mercenary career. He seems to be very well trained with the knife and in stealth.