Cloned dinosaurs are roaming freely on the mainland as human beings face possible extinction in the official trailer for Jurassic World Dominion, the sixth installment in the hugely successful franchise. Universal Pictures describes the film as "a bold, timely and breathtaking new adventure that spans the globe," but what has everybody buzzing is the reappearance of the three stars of the original Jurassic Park.

That's right, Sam Neill's Dr. Alan Grant, Laura Dern's Dr. Ellie Sattler, and Jeff Goldblum's suave, black-clad Dr. Ian Malcolm will join Jurassic World co-stars Chris Pratt and Bryce Dallas Howard in yet another thrilling battle between man and once-extinct beast. We haven't seen Neill's or Dern's characters since 2001's Jurassic Park III. Even better, they're major players in Dominion, not just making brief fan-pleasing cameos.

(Spoilers for prior films in the franchise below.)

The original Jurassic Park is a sci-fi classic, about the doomed attempt of wealthy industrialist John Hammond (Richard Attenborough) to create a theme park of cloned dinosaurs on Isla Nublar, a remote island off the Costa Rican coast. The film won three Oscars for visual effects and sound design, which included groundbreaking advances in computer-generated imagery and animatronic effects. It was also hugely entertaining, grossing over $912 million worldwide during its theatrical run. That success spawned two sequels, The Lost World (1997) and Jurassic Park III (2001), which didn't quite recapture the same magic but were nonetheless commercial hits.

Universal eventually began developing a second film trilogy in which the park was fully functional and open for business, starting with 2015's Jurassic World. Pratt starred as Owen Grady, a Navy veteran and velociraptor handler at the theme park. Howard played Claire Dearing, operations manager; Daniella Pineda played dino veterinarian Zia Rodriguez; Justice Smith played park technician Franklin Webb; Omar Sy played Owen's assistant Barry; and B.D. Wong returned as the geneticist Dr. Henry Wu.