- "We have a landing strip up ahead..."
M.B. Nash was one of the mercenaries hired by Udesky to work for the Kirby family. He is a former master sergeant in some form of the U.S armed forces, according to his dog tags. He took Paul Kirby's satellite phone before he is devoured by the Spinosaurus.
He was the airplane pilot who flew the plane with the Kirbys to find Eric Kirby on Isla Sorna. Nash told Paul that he had spotted a landing strip, and this caused Alan Grant to get upset. Alan tried to get to the front of the plane, but another mercenary named Cooper knocked him out. When Alan woke up, they had already landed. Alan left the plane, and told Paul to make Amanda stop using a Loudhailer to call for her son Eric and her boyfriend, Ben Hildebrand. When Amanda asked why, Nash and Udesky came running out of the jungle. Nash quickly ran inside the plane and started it up as the others got inside. When Billy Brennan asked about Cooper, Udesky replied "Cooper's a professional! He can handle himself!" As the plane was building up speed, Cooper came out of the jungle, nursing a wound to his arm. He screamed to the plane to stop, but Nash couldn't do anything about it. Suddenly, a huge Spinosaurus came out of the jungle and it grabbed Cooper by his waist, killing him. As it was eating him, the plane clipped the Spinosaur's sail and it crashed into the jungle and got lodged in a tree. Nash asked for the satellite phone, and Paul gave it to him. This action kept everyone besides Amanda Kirby from noticing the Spinosaur come up to the plane. It then proceeded to tear the front off of the already wrecked plane. Nash tried to head farther back into the plane, but the Spinosaurus grabbed him by his leg, and it pulled him out of the plane. Screaming, Nash begged the others to save him, but before they could try to help him, the Spinosaur dropped him to the ground. He tried to crawl away, but the Spinosaurus stepped on his back, breaking his spine and killing him, then it ate him a horrified group of survivors watched. He had a Hecker and Koch SL8 fitted with a 10 round magazine and M68 Aim point red dot sight, and what looks like a Mossberg 500 Cruiser 12 gauge slinged over his back.
In the Jurassic Park III: Island Survival Game, Nash is one of the humans that have to flee from the island.
- "Who has the satellite phone?"
- "Help me!"
- "Hang on, everyone!"
- "We have a landing strip up ahead. Do you want me to put 'er down?"
When the Spinosaurus is attacking the plane, Nash's shotgun on his back changes to a rifle, then back to a shotgun before he is killed. Originally, Udesky was going to be killed in the initial Spinosaurus attack leaving Nash to be killed by the Velociraptors. Then, their roles were swapped.