Imagine entering a prehistoric world where you can roll with the dinosaurs — literally roll.

Visitors to Jurassic World, constructed on the same island that was home to Jurassic Park, can take a wild ride in a hamster ball built for two and see the dinosaurs up close and personal. Fortunately the species you travel amongst are herbivores (you hope).

Jurassic World was built on Isla Nubar, the same island off Costa Rica where Jurassic Park once existed. This fourth installment of the “Jurassic” tales occurs 22 years later when Gray (Ty Simpkins) and Zachary (Nick Robinson) visit the theme park, overseen by their Aunt Claire (Bryce Dallas Howard), whom they haven't seen for seven years.

Patted on the head and sent off with her assistant and VIP passes for all the rides in hand, the boys set off. There are hologram dinosaurs in the main lobby of the lab, monorails, a baby dinosaur petting zoo, archaeological digs, the T. rex exhibit, boat rides down a river with, again, hopefully herbivores on the banks — and one of the craziest “rides” yet: that hamster ball for humans.

There are 22,216 dinosaurs on the island now watched via an ultra-sophisticated monitoring system.

What could go wrong? As Claire says, “They're just animals.” Hmm.

Yes, it’s all fun and games until a hybrid breaks free and some unsuspecting thrill seeker becomes lunch.

Not only has the special team of scientists created DNA accurate species of dinosaurs, they've created a hybrid T. rex mix of four other dinosaurs and other creatures, like tree frogs, called Indominus rex.

Why mess with nature? Why, to give waning attendance to the park a hefty boost.

The only returning “Jurassic” character in this film is Dr. Henry Wu (BD Wong), the mad scientist if you will. Dr. Wu was instructed by General Operations Manager Simon Masrani to create a new dinosaur that was “bigger, louder, and with bigger teeth.”

Masrani says Jurassic World exists to “remind us how very small we are.”

The boys aren't the only ones to arrive that day who Claire must attend to. Masrami is on the island as well as potential sponsors from — wait for it — Verizon Wireless.

Claire plans to show the sponsors the “new addition.” She and Masrani head to Indomitus’ area. Masrani notices the window glass is cracked.

Owen Grady (Chris Pratt) is part of the theme park staff, a former U.S. Navy man who has been working with four velociraptors. He is training them, actually, as part of his behavioral research study. He uses a clicker like some of us have used for our canine family members. Scenes with Owen and his raptors will keep your attention.

Masrani tells Claire to bring Owen in and the romance in this fourth Jurassic fantasy is introduced.

When he arrives at the hybrid's area, he, like Masrani, is interested in the dinosaur's life.

Another character is Vic Hoskins (Vincent D'Onofrio), the park's security dude. He sees Owen's raptors as “nature's best killing machines,” not living creatures. Hoskins foresees them replacing ground troops in war time.

“Think of all the lives we'll save,” he tells Owen. “But,” this reviewer asked from her theater seat, “What happens when they stop responding to the clicker?”

Soon the hybrid breaks free and embarks on a killing spree — or, as Claire put it, “We have an asset out of containment!”

The special effects in this film are outstanding. You will be startled, you will shout out loud and there will be highly audible sharp intakes of breath in the theater. But that's all part of the fun seeing a film of this kind.

In addition to the hamster ball scene, other stand out spots include the release of the dimarphodons and pteranodons when the aviary is partially destroyed. They swoop down on the theme park crowd, scooping up some and taking them for a swim, or they just drop them. This scene brought to mind the flying monkeys of “Oz,” but there's one big difference: the monkeys were under the tight control of the Wicked Witch of the West, these flying prehistorics, well, they operate more like independent contractors.

I leave you with one of my favorite lines.

Owen and Claire are trying to track the boys. Claire is frantic. They arrive at a waterfall and surmise the boys must have had to jump. Owen makes a remark about how unprepared she is to be running through a prehistoric jungle what with her high heels and fancy work attire.

Retaliating, she says: “I thought you were an expert tracker.”

Shouts Owen at her: “I was with the Navy, not the Navajo!”

Let the summer fun begin! “Jurassic World,” opens with a sneak preview at The Harbor Theatre on Thursday, June 11 at 7:01 p.m. then Friday, June 12 through Thursday, June 25 at 7 p.m.; and at 2 p.m. on Sunday, June 14 and 21.

The Harbor Theatre is located at 185 Townsend Avenue in Boothbay Harbor: 207-633-0438.