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The game takes place on a fictional location known as Ibis Island in the year 2009. The Secret Operation Raid Team (SORT) has sent an agent, Tom, to investigate a military research facility. During the recon mission, he learns that Doctor Edward Kirk, a world-renowned scientist who was reported dead three years ago, is leading a secret weapons project within the facility. SORT sends four agents (Regina, Gail, Rick, and Cooper) to acquire Kirk and return him to custody.

They arrive onto the island via parachute. Cooper is blown off course and lands in a jungle. A tyrannosaur appears and chases him a short distance throughout the jungle before eating him. The other three agents, unaware of his death, proceed with the mission.

Once inside the base, they discover the mutilated and partially devoured corpses of security personnel and scientists. Shortly thereafter, they discover that dinosaurs are the reason behind the bloodbath at the base. After evading and disposing of many dinosaurs, Regina and the team manage to locate Kirk and apprehend him. As they are preparing to leave via helicopter, the tyrannosaur returns and destroys the helicopter, forcing them to flee back into the base.

Kirk reveals that the dinosaurs were brought to their time by an experiment he was running using his Third Energy technology. A rift in space was created and a pocket of the island from their time was exchanged with the same from the past, bringing dinosaurs back into their time. As the base becomes infested with more dinosaurs, and the tyrannosaur manages to gain entrance, the team discovers an underground river and a hovercraft. They use the hovercraft to escape before the Third Energy reactors, set to overload by Regina, detonate, wiping out all of the dinosaurs on the island and preventing them from escaping to the mainland.


There are four possible endings based on choices made by the player. Near the end of the game, the player has the option to either go after Kirk or find their way off of the island.

  • The first ending is achieved by first following Rick's plan - knock out Gail to prevent him going after Kirk and risking his life. They choose to leave the doctor behind and ready the hovercraft. The Tyrannosaurus wakes up and chases them. Rick fires a rocket at the dinosaur. The rocket hits a fuel tank, causing a massive overload in the Third Energy generator and completely disintegrating a portion of Ibis Island in the process killing the Tyrannosaurus and all of the other dinosaurs. The three agents escape safely, but the status of Kirk is unknown.
  • In the second ending, Regina follows Gail's plan in locating Kirk with the transmitter. Gail reveals that the mission was the retrieval of the Third Energy data, but soon after dies from injuries sustained earlier. Regina punches Kirk in the face for making a joke out of the situation. As Regina gets fuel for the hovercraft, the T. Rex awakens. As the agents and Kirk escape, unbeknownst to them, the T. Rex splashes into the river. Regina distracts it, and Rick shoots a failsafe system that would have kept the tunnel closed. After the explosion, Regina is forced to throw an explosive into the Rex's mouth and detonate it. 
  • The third ending can be achieved by agreeing with Rick's idea in retrieving the Third Energy data, but heading to the underground heliport using the Transmitter. Regina catches Kirk trying to fly out and knocks him unconscious. Rick and Gail abandon the hovercraft when the Tyrannosaurus destroyed it, and are alerted to the helicopter's location. All three agents and Kirk escape the Island, with the Tyrannosaurus being killed by a bomb dropped by Rick.
  • The last ending is similar to the above but involves choosing Gail's plan but instead going to the Underground Heliport first.  After a brief cutscene showing the chopper, the player then will have to go to the area where Gail is normally found in the ending where he dies. Instead of dying, Regina will tell him about the chopper and then Regina handcuff's Kirk and takes him to the chopper with Gail limping behind them. After this cutscene, Gail will be keeping an eye on Kirk from inside the chopper. Regina will call Rick and tell him that Gail is doing fine and that Kirk has been apprehended. Rick will then head over to the chopper because the hovercraft was destroyed. The final battle with the T. Rex is basically the same as the other good ending above, as well as the CG cutscene as well.


Gail survives Kirk survives Helicoper Hovercraft
Ending 1 Yes No No Yes
Ending 2 No Yes No Yes
Ending 3 Yes Yes Yes No
Ending 4 Yes Yes Yes No

The game keeps track of how many endings the player has unlocked at the end of the game. In the American, and the European PlayStation versions of the game the player can unlock "Operation: Wipeout", a minigame where the player must eliminate a set amount of dinosaurs in a certain time with limited ammunition, by completing the game once in under five hours. However, in the PC and dreamcast versions, this minigame does not have to be unlocked and can be played without completing the normal game.