Return to Jurassic Park is a mod for the 1998 PC game "Trespasser" set on Isla Nublar several years after the events of the first film. Running on an upgraded Trespasser engine, players will get to explore the abandoned facilities through nine expansive levels covering the entire island, while at the same time searching for weapons and supplies as well as solving challenging puzzles; encounter a wide range of dinosaurs, from the tiny compsognathus to the massive aquatic tylosaurus; and uncover a story unlike any previously presented in a Trespasser mod.
A lone concrete watch tower overlooks Holding Pen #3. This, along with other extensive modifications to the containment systems and fencing, were the fortifications put in place in order to contain Jurassic Park's velociraptor population. Yet a fatal error in the plan to restore order to the island proved to be the flaw that ultimately rendered all of these defences and security systems useless, allowing the deadly Raptors to break out into the main facilities. Although the three InGen-cloned Raptors were wiped out during the second night of the Isla Nublar incident, only a few of the survivors were at all aware of their pre-quarantine nesting sites hidden away in the jungle...