<P> They learn the game's story from NPC Nigel: Corrupt Russel Van Pelt stole the Jaguar's Eye (a magic jewel), cursing Jumanji . Nigel escaped Van Pelt with the jewel, and the players must return it to a jaguar statue and call "Jumanji" to lift the curse . Nigel warns them that Van Pelt will stop at nothing to retrieve the jewel, which gives him control of Jumanji's animals . They begin tackling the game's increasingly - difficult "levels", losing lives as they do so . The four are rescued by Alex (the missing fifth player, whose avatar is pilot Jefferson "Seaplane" McDonough). Taking shelter in a jungle house built by Alan Parrish, Alex believes that he has been in the game for a few months and is distressed to learn that it is really twenty years . The newcomers vow to help him return home . They break into a transportation shed, commandeering a helicopter to fly to the jaguar statue and return the jewel, but Fridge drops the jewel into a herd of white rhinoceros . Spencer uses one of Fridge's lives, pushing him out of the helicopter as a distraction, and retrieves the jewel . Alex loses his last life when a mosquito bites him, but Bethany performs CPR and transfers one of her lives to him . </P> <P> At the statue, the players are surrounded by a pack of jaguars and Van Pelt's forces . They outmaneuver their opposition while Spencer and Martha race to the statue . Van Pelt confronts Martha (trapped in a pit of venomous snakes) and demands the jewel, but she sacrifices one of her lives to re-spawn and get it to Spencer . With the players on their last lives, they end the game with Van Pelt disintegrating into a bunch of rats and return to the real world; Nigel bids them farewell, but Alex does not appear with them . They find the formerly - dilapidated Vreeke home restored and decorated for a Christmas family gathering . An adult Alex arrives, returning to where he left off in 1996 . Now married with children, he named his eldest daughter after Bethany out of gratitude for saving his life and introduces them to his infant son, Andy . </P> <P> Spencer and Fridge reconcile, Bethany begins caring for others than herself and plans a summer backpacking adventure, Martha and Spencer become romantically involved and the four are now friends after their experiences in the game . When they hear Jumanji's drumbeats, they bring the game behind the school and Fridge destroys it with a bowling ball (found in detention) to prevent anyone from playing it again . </P> <Ul> <Li> Dwayne Johnson as Dr. Smolder Bravestone, an Indiana Jones - like archaeologist and explorer who is Spencer's avatar . Bravestone's strengths are stamina, courage, reflexes, climbing, smoldering intensity, and boomerang throwing . Being the archetypically masculine, intelligent, and courageous video game hero of the story, he apparently has no weaknesses . He is credited as "Spencer". <Ul> <Li> Alex Wolff as Spencer Gilpin, a nerdy gamer at Brantford High School who goes to detention with Fridge, Martha, and Bethany, for writing Fridge's homework for him . Spencer is panphobic; he fears everything or nothing . His experience as Smolder Bravestone helps him cope with his anxiety and becomes assertive . He later becomes Martha's love interest . He is credited as "Young Spencer". </Li> </Ul> </Li> <Li> Jack Black as Professor Sheldon "Shelly" Oberon, a cartographer, cryptographer, archaeologist, and paleontologist who is Bethany's avatar after mistaking the character's presented name ("Shelly") for that of a woman and calling him, "the curvy genius ." Though Oberon's strengths are his fields of his expertise, because of his state of being as an "overweight, middle - aged man", Oberon lacks endurance . He / she is credited as "Bethany". <Ul> <Li> Madison Iseman as Bethany Walker, a pretty and popular yet narcissistic and self - centered teenage girl at Brantford High School who goes to detention with Spencer, Fridge, and Martha, after talking on her phone during a quiz and displaying an arrogant contempt towards her class in the process . Her experience in the game changes her for the better, becoming apathetic with her smartphone, friendly, and seeks exciting interests . She is credited as "Young Bethany". </Li> </Ul> </Li> <Li> Kevin Hart as Franklin "Mouse" Finbar, a zoologist and weapons specialist whom Fridge chose as his avatar due to the character's nickname being misread as "Moose" due to the game's font . Finbar's status as weapons specialist makes him Bravestone's weapon valet, having everything Bravestone needs in his signature backpack . He is nicknamed "Mouse" for his short stature; though this degrades him of speed and strength, he uses his nickname to rendezvous with the others in the climax of the film on the back of an elephant that was charging at him earlier . Cake makes him explode, making it another weakness . He credited as "Fridge". <Ul> <Li> Ser'Darius Blain as Anthony "Fridge" Johnson, a Brantford High School football jock who lacks confidence to succeed academically, namely because he cares more with dating than studying . He is kicked off the football team and sent to detention for having Spencer write his essays for him; he is the one who discovers the Jumanji video game, as well as the bowling ball he uses to destroy it . Because of his avatar is highly intelligent, Fridge gains confidence from being Finbar to succeed intellectually . He is credited as "Young Fridge". </Li> </Ul> </Li> <Li> Karen Gillan as Ruby Roundhouse, a Lara Croft - like commando, martial artist, and dance fighter who is Martha's avatar (after Martha was peer - pressured into playing with the others). Roundhouse is proficient in karate, t'ai chi, aikido and dance fighting and is reputed as "killer of men" because of both her skills and attractiveness . Similar to Bravestone, Roundhouse is the archetypically intelligent, athletic, beautiful, and scantily clad video game heroine of the story, with her only weakness being venom, such as that found in various animals and vegetation in the game . She is credited as "Martha". <Ul> <Li> Morgan Turner as Martha Kaply, a teenage girl at Brantford High School who goes to detention with Spencer, Fridge, and Bethany, for objecting to physical education class and disregarding her teacher . She later becomes Spencer's love - interest and gains appreciation with physical fitness after her experience as Ruby Roundhouse . She is credited as "Young Martha". </Li> </Ul> </Li> <Li> Nick Jonas as Jefferson "Seaplane" McDonough, Alex Vreeke's avatar . McDonough is a mysterious guide, adventurer, and pilot in the game, who waits for and joins the other avatars as they attempt to escape Jumanji . McDonough's strengths are piloting and making margaritas that "Mouse" / "Fridge" takes a liking to . His only weakness is mosquito bites, which is bad for him and all the more ironic since the jungle, being a tropical one, is teeming with mosquitoes . He is credited as "Alex". During his twenty - year absence, only a few months have passed for him in the game world; and in the meantime, he lives in a treehouse built and once occupied by Alan Parrish (portrayed by Robin Williams and Adam Hann - Byrd in the 1995 film Jumanji). <Ul> <Li> Mason Guccione as Alex Vreeke, a teenage boy who played, and was trapped inside, the Jumanji video game for 20 years . He is credited as "Young Alex". Colin Hanks portrays adult Alex Vreeke after he returns to 1996 and appears 20 years later, changing history as a result . Out of gratitude for Bethany saving his life, he named his eldest daughter after her . </Li> </Ul> </Li> </Ul>

Who played the grown up alex in jumanji 2