太空探險家賽門意外發現外星生物，這個叫「阿諾」的可愛小毛怪，長的可愛又友善，但是賽門的邪惡兄弟Cecil卻把它綁架了，但麻煩的還不只於此，受到攻擊與威脅的「阿諾」會自動分裂，一個變兩個，兩個變四個，長的又快又邪惡，轉眼間平靜小鎮斥充邪惡小怪物，賽門與「阿諾」要如何拯救小鎮？...
In the not too distant future, a very smoggy and overpopulated Earth government makes it illegal to have children for a generation. One couple, unsatisfied with their substitute robot baby, breaks the rules and gets in a lot of trouble. (Z.P.G. stands for Zero Population Growth).
这是一部典型的史泰龙式的科幻电影。2139年，科学高度发达。凭借高科技武器和过人身手，爵德（西尔维斯特•史泰龙 Sylvester Stallone 饰）成了梅洛城法官、警察和行刑人于一身的判官战警，他发现罪犯可以马上逮捕、马上判刑，死刑的话还可以马上执行。就是这样一个四出惩治罪恶的判官，这次竟然被诬蔑成杀人犯。 幸好有主席法官尽力相助，爵德才幸免一死，不过他被逐出了梅洛城。不甘心含冤受屈的爵德冒险潜回了梅洛城调查整件事的来龙去脉，犯罪分子里戈（阿曼德•阿山特 Armand Assante 饰）逐渐浮出了水面……
A group of middle school kids stumble upon a chest full of incredible toys from the future. The discovery takes them on an adventure using their newfound toys to save their neighborhood and ultimately the world from a maniacal corporate madman. In the process, these "loser" kids learn they have the qualities they thought they were lacking all along.
