Peter is upset after the school bully and his friends trick him into retrieving their football by promising that he can play with them, but betray him and knock him into a mud puddle.
Peter and Judy prepare to enter Jumanji, but Aunt Nora stops them because she believes the game is causing their bad grades.
Judy connects the laptop to a mainframe computer, giving it the ability to analyze Jumanji and predict the future, revealing that a flash flood will strike.
The trio flee to higher ground as the Ibsen steals the laptop and uses it to create monsters and reshape the terrain, a power which he claims makes him Jumanji's ruler.
Peter realizes that their clue is connected to how to stop the computer, which it tries to answer but cannot, causing it to shut down along with the Ibsen, who is revealed to be a machine and not the real one.
After a bolt of lightning strikes and kills Alan by blasting him, Slick gives them the ChronoRepeater, which allows them to turn back time.
In Jumanji, Peter uses a jar containing a swarm of honey bees to fend off porcupines and monkeys, which solves their clue and allows them to return home.
Peter vows to destroy the game if Alan dies, which Stalker overhears and enlists the Slick, the Van Pelt, and the Ibsen to help him kill them to protect Jumanji.
As Alan rests in a magic pool that shows his dreams in the water, Peter attempts to trick Jumanji by pretending that his hat is what he most adores, but is punished by being transformed into a frog.
While searching for Squint some time later, he confronts them and reveals that what he is really after is Nolda, a one-eyed sea monster that he seeks to kill as revenge for her eating his nose.
Upon returning home, she and Peter enter Jumanji and Alan takes them to the Temple of the Skiwans, whose inhabitants found a way out of the game.
There, a version of Judy's teacher who is like the Ibsen captures them and gives them a problem to solve, since Brantford requires brain power to be beaten.
Alan destroys Ibsen's power generator and the group uses his controller to turn the robotic people against him, with him promising revenge as he escapes.
As punishment, Peter is exiled to Desperation Island, where he befriends a Fludgel named Eep, and Alan and Judy are captured while trying to free him.
Peter decides to enter Jumanji despite being sick with a fever, and they find a pearl in a giant clam's mouth, which they believe to be the answer to their clue.
They decide to take Peter to the Manjis to treat his illness, with Tribal Bob believing that the clue refers to a statue that needs the pearl to prevent a volcanic eruption.
After Alan puts the pearl into the statue, their clue is solved and they return home, but the Manjis begin to show signs of Peter's illness.
After noticing an approaching storm, Judy realizes the significance of the clue and gathers the three Peters together to be struck by lightning, fusing them back into normal.
Professor Ibsen, who has been transformed into a giant frog, sends Peter and Judy back in time in hopes that he can eliminate them at his full strength.
After the real Alan saves them from a waterfall, they learn from him that Ibsen had gotten a cure for his transformation from Trader Slick, but it shrunk him and turned him blue.
Alan reappears and saves Judy, and when Van Pelt appears, he reveals that the chest contains an Arsinoitherium horn, which he claims is the last of its kind.
After encountering Trader Slick, Peter trades him a rabbit's foot for a growth potion, and grows to giant size, allowing him to fend off a lynx and the wild pigs when they attack the group.
At home, she and Peter enter Jumanji and go to Slick's shop to get a boltcutter to help Alan return a baby albino gazelle to her herd.
The group disguise themselves to infiltrate the auction and learn that Slick is selling the Trans-Vector, a device which can open a portal to another world, which he demonstrates by sending a rhino there.
They try to grab the artifact, but Van Pelt sends Alan to the other world and Peter and Judy team up with Ibsen, who reveals that he wants to destroy the Trans-Vector.
They realize that Ibsen may be behind what is happening and head to his lab, where he reveals that he created a machine called the Triangle of Terror that can bring nightmares to life.
In Jumanji, Peter attempts to cross a river below a cliff but is swept away and washes ashore, where the Manjis have their witch doctor revive him using a voodoo doll.
With their clue solved, they return home, where Peter uses the doll to take revenge on his teacher, baseball coach, Rock's gang, and Aunt Nora.
The group heads for Jumanjicon to find the Golden Goblet of Jumanji, which can restore their youth, and along the way reunite with Ashton Phillips.
After touching it, they see some of their previous adventures in reverse order and realize that watching the Crystal for long enough will eventually show Alan entering Jumanji, giving them his clue and allowing him to escape.