Without warning, millions of mysterious alien "doors" suddenly appear around the globe. In a rush to determine the reason for their arrival, mankind must work together to understand the purpose of these cosmic anomalies. Bizarre incidences occurring around the sentient doors leads humanity to question their own existence and an altered reality as they attempt to enter them.

本片根據約翰修斯的小說改編而成，敘述3個高中新生在入學第一天就飽受校園惡霸欺負，為了不讓將來的日子越來越難過，他們在「軍人榮光」雜誌中刊登廣告，希望顧到一名保鏢。沒想到來應徵的是崔比，他以海灘為家、收費低廉，而他將為3個小老闆帶來前所未有的震撼教育。