When Spencer the nerd (Alex Wolff), Fridge the jock (Ser’Darius Blain), Bethany the self-centered (Madison Iseman), and Martha the aloof (Morgan Turner) are sent to the school’s basement for detention, they unwittingly open a portal into another world through a video game console.
Transported to the world of Jumanji, the four teens inhabit avatars in direct contrast to the real-world selves. Spencer, sickly and scared, becomes the muscle-bound explorer Dr. Smolder Bravestone (Dwayne Johnson). Fridge enters the game as the zoologist Franklin “Mouse” Finbar (Kevin Hart), a diminutive researcher who acts as Bravestone’s sidekick and weapon holder. Bethany and Martha become Professor Sheldon Oberon (Jack Black) and Ruby Roundhouse (Karen Gillan), respectively. Where the former is now a portly man whose role is the group’s cartographer, the latter becomes the team’s hand-to-hand specialist and bombshell.