A forty-something mathematician and chaos theoretician working at the Santa Fe Institute. Dressed perpetually in black, he is the sole survivor of a team of genetics specialists involved in the disastrous InGen project four years prior. He acts as a philosophical voice, believing species choose to adapt or face extinction, and harbors deep skepticism about rumors of surviving dinosaurs.

A wealthy, Yale-trained paleontologist and zoologist known for his eccentricities and fast driving in his red Ferrari. He possesses a lanky, gaunt physique resembling a praying mantis. Driven by intense curiosity about speciation, he eagerly investigates rumors of unidentified animal carcasses washing up on Costa Rican beaches, financing his own expeditions to find the truth.

A renowned field animal behaviorist who studies predators like hyenas in Africa. She is a resilient, pragmatic scientist accustomed to the harsh realities of fieldwork in male-dominated environments. Her deep understanding of complex animal social structures provides her with unique insights into pack behaviors and survival tactics on the island.

A retired engineering professor who now runs Thorne Mobile Field Systems, a company designing specialized field equipment. He looks like a retired prizefighter with wire-frame glasses. He prefers practical, hands-on science over theoretical academic debates and acts decisively when his client goes missing.

The unscrupulous CEO of the genetics research company Biosyn. Known for his mercenary business practices and willingness to exploit animals as commodities, he views the rumors of surviving dinosaurs purely as a financial opportunity. He mounts a swift, secretive mission to steal fertilized dinosaur eggs to secure lucrative patents.

A bright, thirteen-year-old middle school student who feels socially isolated due to her intelligence. She looks up to successful female scientists and acts as an eager research assistant to Dr. Levine. Troubled by his sudden disappearance, she actively seeks answers, eventually stowing away in the expedition trailers.

An eleven-year-old computer whiz and middle school student. He helps Dr. Levine with his research tasks and is remarkably quick to navigate complex operating systems. Concerned about his mentor's absence, he tags along with Kelly to investigate, using his technical skills to access critical corporate data.

The chief mechanic and engineer at Thorne Mobile Field Systems. He assists in building and modifying the specialized vehicles for Levine's expedition. He prefers systems that can be fixed and controlled, making him highly anxious when dealing with the unpredictable environment of an abandoned island.

A local Costa Rican who guides Dr. Levine during his initial, hasty expedition to locate the source of the washed-up animal carcasses. He relies on his knowledge of the terrain but remains completely unaware of the genetically engineered hazards hidden on the remote island.

A field agent and hired gun working for Biosyn. He conducts corporate espionage for Dodgson, staking out Levine's apartment and gathering intelligence on the rival expedition's plans and island destinations.

The former head of the bankrupt InGen Corporation. He originally funded the ambitious genetic engineering project to hatch live dinosaurs, establishing a massive, hidden manufacturing facility on Isla Sorna to supply his failed public park.