He was portrayed by Sam Neill.
Grant is invited by John Hammond, founder and CEO of Ingen to a theme park known as Jurassic Park on Isla Nublar. He and his partner Ellie Sattler accept the offer in exchange for a further three years of dig funding. When they arrive Grant is astonished by the sight of a living, breathing Brachiosaurus. The characters see how the DNA was extracted and then witness the birth of a Velociraptor.
But the day quickly turns into an episode when the Tyrannosaurus Rex escapes the paddock. He protects Lex Murphy and Tim Murphy while they try to make it through the park. This includes evading a falling Ford Explorer down a 20 foot tree, running from a herd of Gallimimus and climbing over an electric fence. Lex is able to enter the Visitor Center's computer room and restart all of the systems in the park. Alan and the kids battle raptors but Rexy the T. rex kills the raptors before they can attack the protagonists and make it to the front of the Visitor Center where John picks them up. Alan tells John that he has decided not to endorse his park and John now agrees with this sentiment. They board a helicopter and leave the island.
Jurassic Park IIIEdit
The experience on Isla Nublar has left Alan somewhat openly jaded towards dinosaurs, nearly to the point of post-traumatic stress disorder. Despite this, he continues to work as a paleontologist, this time at a dig site near Fort Peck Lake, Montana. The dig is cripplingly underfunded however, due to public interest in recovering dinosaur fossils growing diminished after the revelation of InGen's cloned dinosaurs, which Grant openly refers to as "circus freaks" rather than true dinosaurs. His relationship with Ellie has ended, though they remain close friends. Now he has a new partner in Billy Brennan, his apparent protege, but it is Alan who must rein in Billy's headstrong tendencies.
He visits Ellie and her family. In a way, he envies Ellie and her happy family and wonders why he shies away from marriage and fatherhood.
He gives lectures on the intelligence of raptors. However, his listeners are only interested in the events in 1993 and the San Diego incident. He states that nothing could get him to go to The Five Deaths (Isla Sorna/SiteB). He is later bribed into going on an aerial tour of Isla Sorna by wealthy couple, Paul Kirby and Amanda Kirby. Alan invited his paleontology colleague Billy Brennan to accompany him on the trip.
While they are flying over the island, Alan notices that the pilot is going to land. Alan begins to protest but is knocked unconscious by Cooper, one of the mercenaries hired by the Kirbys. When Alan wakes up, they have landed on the island already. Then after a take off disrupted by a Spinosaurus, Alan and the others are stranded on the island. Alan soon discovers the truth that the Kirby's are not wealthy or married, but a divorced couple who were searching for their son, Eric, who was lost on the island eight weeks before, who sought Grant's help based on his adventures on Isla Nublar, unaware the island Eric had visited was Isla Sorna. Alan, using his knowledge of dinosaurs, survives with the Kirby's and an injured Billy, who had attempted to steal unhatched Raptor Eggs in the pursuit of funding for the dig site. Despite the traumatic events of the film, his love for dinosaurs is ultimately reinvigorated after once more experiencing them firsthand.
- In the film, Grant dislikes the kids at first, contrary to the father-like figure in the first Jurassic Park novel.
- Grant is based on Jack Horner, a real-life paleontologist that helped the movie crew in making dinosaurs based on facts and discoveries in the real world.