While cleaning their high school's basement during detention, four teens discover a video game version of Jumanji. After picking adult avatars, they're sucked into a jungle and physically transformed: Gangly Spencer become becomes the strong, handsome archaeologist and explorer leader Dr. Smolder Bravestone. Spoiled beauty Bethany becomes overweight male cartographer and cryptographer Professor Shelly Oberon. A star athlete, Fridge, transforms into a shorter, less athletic weapons specialist and zoologist named Franklin "Moose" Finbar. Lastly, unpopular Martha turns into a beautiful, strong commando named Ruby Roundhouse. To escape the game, they must learn to think differently about themselves and one another.