NOTE: This spoiler was submitted by Jeremy

Four years after dinosaurs have been set loose on the mainland, humans have had to adjust to their presence. The Mosasaurus is seen pulling a fishing boat down after grabbing its cage of fish with its jaws. Many people have died from dino-related incidents, and while many think the dinosaurs should be all killed off, others have found a way in the black market to illegally sell and distribute captured dinosaurs. The government hands the reins to BioSyn Genetics, a company led by Lewis Dodgson (Campbell Scott) with the promise to keep the dinosaurs held at a sanctuary in Italy’s Dolemite Mountains to further research them for pharmaceutical purposes. News coverage also notes that Maisie Lockwood (Isabella Sermon) has disappeared after her true nature as a clone was made aware.

At a facility in Nevada, Claire Dearing (Bryce Dallas Howard) and Zia Rodriguez (Daniella Pineda) smuggle a baby dinosaur from a BioSyn lab. They join Franklin Webb (Justice Smith) as they escape in a van, but security guards chase after them until the three manage to lose them. Franklin and Zia tell Claire they can no longer keep this type of work up, and while they support Claire and her endeavors, they are moving onto jobs that are safer for them.

Somewhere near the snowy mountains in Nevada, Owen Grady (Chris Pratt) is riding a horse to wrangle a large dinosaur. After he’s done, he goes back to the cabin that he shares with Claire and Maisie, as he and Claire are now her adoptive parents. Although Maisie likes to stray from home and witness the dinosaurs on land, Claire and Owen try to keep her hidden for fear that someone is after her. This causes her to get annoyed with them, and she has also become curious about Charlotte Lockwood, whom she was cloned from. Sure enough, mercenaries led by Rainn Delacourt (Scott Haze) are spying on them in the woods, Maisie being their target.

Not far from the cabin, Blue the raptor has asexually reproduced a child (who Maisie later names Beta). They go hunting a rabbit together, and Blue helps Beta fight off another dino trying to grab their kill.

In Texas, two children are chased by an enormous swarm of locusts. This is brought to the attention of paleobotanist Ellie Sattler (Laura Dern). She investigates the farm where the locusts attacked and ate up all the crops. Ellie is told by the children’s mother that the neighboring crops, which were untouched by the locusts, are planted by BioSyn.

Ellie reunites with Dr. Alan Grant (Sam Neill), who is working with other aspiring paleontologists. She brings a captured locust to him and explains the situation, fearing that if they spread, they may wreck the food chain. Alan and Ellie figure that BioSyn must have made them so that their crops are all that remains. Ellie wants to get DNA from another locust at the BioSyn sanctuary and asks for Alan’s help. She was already invited by their old friend, Dr. Ian Malcolm (Jeff Goldblum). Despite showing some hesitance, Alan ultimately agrees to join.

Back at the cabin, Blue and Beta come upon Owen, Claire, and Maisie. They are all surprised to see Blue having become a mother. The mercenaries soon make their move and capture Beta. Maisie rides her bike across the bridge and is also taken by the villains. Owen sees this and gets Claire to go after them. Claire says she knows who can help them.

Claire contacts Franklin, who now works for the CIA. He helps them get info on Delacourt and points them to Owen’s former coworker at Jurassic World, Barry Sembene (Omar Sy), who can help take them to wherever the mercs are taking Maisie and Beta.

Alan and Ellie arrive at the sanctuary and meet Ramsay Cole (Mamoudou Athie), BioSyn’s Head of Communications. He introduces them to Dodgson, who promises they are working on something revolutionary and groundbreaking. Alan and Ellie are escorted to find Ian giving a lecture. Afterwards, he joins them and discreetly tells Ellie that the locusts are indeed part of a sinister scheme by BioSyn. Meanwhile, Dodgson meets with Dr. Henry Wu (BD Wong), who has since become remorseful of his actions in helping keep these experiments going, as he notes that the locusts have grown at an alarming rate.

In Malta, an associate of Dodgson’s, Sonoya Santos (Dichen Lachman), calls him to say that Maisie and Beta have been transported separately to BioSyn HQ. Owen and Claire also arrive and reunite with Barry. He brings them to a black market dinosaur ring, where dinos are being sold, eaten, or forced to fight. Claire meets Kayla Watts (DeWanda Wise), a pilot who flies for the vendors. She warns Claire about messing with anyone there, but eventually agrees to help Claire find Maisie. As this happens, Owen and Barry stay hidden and witness Delacourt meeting with Santos to smuggle Atrociraptors. The two confront and fight Delacourt and his men. Owen orders him to say where Maisie and Beta are, and he just gives him Santos’ name before he gets eaten by dinos in the fighting ring. Claire fights Santos and learns that Maisie is headed for BioSyn, and she outruns a loose dinosaur before joining Kayla. Barry arrests Santos, but not before she sics one of her dinos on Owen, who is riding a motorcycle to catch up with Claire and Kayla. He manages to board Kayla’s plane just as she is getting ready to take off with Claire, and Owen uses the motorcycle to knock the dino off the ramp and into the ocean.

Maisie arrives at HQ and meets Wu. He explains to her that she is not a clone of Charlotte’s, but her actual daughter who was reproduced asexually just like Beta. Maisie watches video footage of Charlotte (Elva Trill), and sees when she was pregnant with Maisie. Charlotte suffered from a disease, but she managed to alter Maisie’s DNA to remove all traces of the disease. Wu hopes that by studying Maisie’s DNA, he can reverse the locust outbreak by altering their DNA.

Alan and Ellie sneak into the containment room for the locusts to get a DNA sample, just as Maisie tries to escape with Beta. Dodgson sounds the alarm, which causes the locusts to swarm around Alan and Ellie, but they manage to get out safely. They meet Maisie, who knows who they are and vice versa. She joins them as they run. They are found by Ramsay, who agrees to help them because he finds BioSyn’s work to be unethical. He sends them away in a monorail to safety. Ellie tells Maisie that she knew Charlotte as a student, and says she was a brilliant and kind person.

In the air, Kayla’s plane is attacked by Quetzalcoatlus, forcing Claire to eject and fall into the trees after they rip her parachute. Owen and Kayla crash into a nearby ice lake. They attempt to safely make their way across it but are chased by another dinosaur. The two make it across just in time and head off to relocate Claire. She gets down from the tree but has to quietly evade a Pyroraptor from stalking her in the forest. Owen and Kayla hide as the T-Rex makes her appearance to eat, but she is held off by a Giganotosaurus, a much larger predator. They manage to get to Claire.

Alan, Ellie, and Maisie are making their way through caverns and find dinosaurs attacking, prompting them to run until they make it outside. Meanwhile, Ian tears Dodgson a new one for his actions, and Dodgson fires him. Ian works with Ramsay to get back to Ian’s friends. He helps them escape the dinos by freeing them from the enclosure. Dodgson then sets fire to the locust lab to destroy evidence. The flaming locusts break free and begin flying out into the open. Alan, Ellie, Ian, and Maisie attempt to outrun a large dinosaur in a van but are knocked down a hill. Luckily, they land near Owen, Claire, and Kayla, reuniting the former two with Maisie. Claire also gets to meet Ellie while Owen meets Alan. The group is then stalked by the Giganotosaurus, who almost gets Maisie, but she escapes. Ian fends it off by throwing a burning cloth into its mouth.

While the heroes work on an escape plan, BioSyn starts to burn to the ground, forcing the employees to flee. Dodgson attempts to make off with his work, and Ramsay tells him off one last time before leaving. Dodgson attempts to get away in the monorail, but is cornered by a trio of Dilophosaurus, who make a meal out of him. Beta comes upon the heroes and is sedated so they can safely bring her along. They are also found by Wu, who has found a way to alter the locusts’ DNA to stop the spread. Just as the group prepares their leave, the Giganotosaurus reappears, but is then caught between the T-Rex and a Therizinosaurus. The humans flee to avoid the dino fight, and it ends when the T-Rex pushes the Giganotosaurus into the Therizinosaurus’s claws.

Upon returning to safety, Alan and Ellie rekindle their romance and later head to Washington DC to testify against BioSyn. Wu’s work is a success and stops the locust spread. Owen, Claire, and Maisie return home and reunite Beta with Blue. Before retreating back into the forest, Blue shares one last look with Owen.

One final clip of Charlotte plays over society adapting and adjusting to dinosaurs on the mainland, with her noting that humanity will someday learn to co-exist with the dinosaurs.

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Four years after dinosaurs are set loose onto the mainland, genetics company BioSyn steps in to bring the dinosaurs to a sanctuary in Italy. CEO Lewis Dodgson creates a swarm of locusts to destroy all crops except those made by BioSyn. This is brought to the attention of Ellie Sattler, who reunites with her old colleague/lover Alan Grant, as they are invited by their old friend Ian Malcolm to BioSyn and stop the spread.

Owen Grady and Claire Dearing have been living in a cabin with Maisie Lockwood as their adopted daughter. They also learn that Blue the raptor has asexually reproduced a child, who Maisie names Beta. Maisie and Beta are both captured by mercenaries working for BioSyn, as Dr. Henry Wu reveals to Maisie that she is not a clone, but the biological daughter of Charlotte Lockwood, Benjamin Lockwood's daughter who died. She asexually reproduced Maisie just like Blue with Beta, and since Charlotte altered Maisie's DNA to eradicate a disease that Charlotte was suffering from, Wu hopes to use this to stop the locust spread, as he has since become remorseful in his actions for helping the wrong people.

The heroes are joined by allies Kayla Watts and Ramsay Cole as their paths eventually cross. Alan and Ellie help Maisie escape BioSyn, but they are caught in the middle of a dinosaur fight when the Giganotosaurus attacks them, but the beast is killed by the T-Rex and a Therizinosaurus. Meanwhile, Dodgson attempts to escape after destroying evidence of his evil deeds, but he gets eaten by a trio of Dilophosaurus. The heroes escape and recover Beta.

Wu stops the locust spread after perfecting his experiment. Alan and Ellie get back together. Maisie returns home with Owen and Claire, and they reunite Blue with Beta. Humans eventually learn to adapt to co-existing with dinosaurs.