After their father is called into work, two young boys, Walter and Danny, are left in the care of their teenage sister, Lisa, and told they must stay inside. Walter and Danny, who anticipate a boring day, are shocked when they begin playing Zathura, a space-themed board game, which they realize has mystical powers when their house is shot into space. With the help of an astronaut, the boys attempt to return home.
Jumanji follows the adventures of various people who find themselves imperiled when playing Jumanji, that will either unleash its dangerous elements into the real world or trap the players within the game. Ultimately, the only way to end the disruptions is to finish the game while enduring its resulting dangers with each succeeding move.