Danny and Walter are two brothers who hardly get along even while driving their parents to distraction as their older sister tries to ignore them. Despite their squabbling, the brothers manage cooperate enough to play an old mechanical board game named Zathura. However, after their first move, they find that the game has apparently flung them, their sister and their entire house into outer space. Furthermore, the brothers surmise the only way to return home is to finish the game. However with almost every move, new dangers arise as the siblings find themselves learning to cooperate in ways they never expected as they realize what they mean to each other.
两个小男孩在公园中玩耍时,意外地发现了一个长方形的盒子。但盒子非常的陈旧,所以他们认为这只不过是一个非常陈旧并呆板的游戏,正打算扔掉它,这时他们的视线越过盒子中的丛林游戏,发现了第二个游戏板,在这个游戏板上面刻着宇宙空间的图案,而且还有一条彩色的路径直通往一个紫色的行星—— Zathura。
这引起了兄弟二人的好奇心,于是他们按照游戏板上的指示开始了游戏。只要其中的一个人转动骰子,他们就有可能面对可怕的流星雨或是巨大的机器人,在面临这些可怕的事情时,兄弟二人开始互相依赖,互相帮助,而且只有他们共同努力克服困难将游戏结束,他们才能回到原来的世界当中……