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.
兩個小男孩在公園中玩耍時,意外地發現了一個長方形的盒子。但盒子非常的陳舊,所以他們認為這隻不過是一個非常陳舊並呆板的遊戲,正打算扔掉它,這時他們的視線越過盒子中的叢林遊戲,發現了第二個遊戲板,在這個遊戲板上麵刻著宇宙空間的圖案,而且還有一條彩色的路徑直通往一個紫色的行星—— Zathura。
這引起了兄弟二人的好奇心,於是他們按照遊戲板上的指示開始了遊戲。隻要其中的一個人轉動骰子,他們就有可能麵對可怕的流星雨或是巨大的機器人,在麵臨這些可怕的事情時,兄弟二人開始互相依賴,互相幫助,而且隻有他們共同努力克服困難將遊戲結束,他們才能回到原來的世界當中……