Universal Pictures is set to release Jurassic Park IV on June 13, 2014. Paleontologist Jack Horner, the inspiration behind the trilogy’s Dr. Alan Grant character (Sam Neil), returns to the franchise as technical adviser.

While promoting the 3D re-release of Jurassic Park, Horner told USA Today that a new and never-seen-before dinosaur will be at the center of the sequel’s story.

He tells the site:

I can’t actually tell you who that will be. But you’ll want to keep the lights on after you see this movie.

Safety Not Guaranteed director Colin Trevorrow will helm the Steven Spielberg-produced 3D sequel, the first entry in the series since 2001’s Jurassic Park 3. The franchise has earned more than $2 billion worldwide.