Cabella Oil and Brandini's have been competing oil ranches for decades. However, it wasn't always this way. Founders Raphael Brandini and Frank Cabella once worked harmoniously together, until their relationship fractured, causing them to split their joint ranch into two. Feisty and competitive heir to homegrown operated Cabella Oil, Nicole Cabella is determined to prove she's ready to take the reins of her family's business. And she's all set to initiate a renovation plan that will allow her to expand Cabella to the next level. All set, until Jake Brandini re-appears in Sunset Valley, that is. Corporate attorney Jake is sidetracked from his day-job when he's called back to the juggernaut Brandini ranch due to a family emergency. While there, Jake identifies a land dispute at the border between the Cabella and Brandini properties. Having been neglectful to his own family company, he decides to win back the land for them. In doing so, he re-ignites the rivalry between both factions, as Nicole refuses to concede to his claim on the land. Instead of pursuing a long and costly court battle, the local Sunset Valley judge proposes an unconventional manner of deciding the land's ownership: whichever ranch wins the annual Sunset Valley Olive Oil Competition wins the land. The Brandini's have won three consecutive years, so Jake is confident in accepting the challenge, though he personally has no experience manufacturing oil. On the other hand, Nicole has oil in her blood, but she'll have to conquer her own self-doubt if she wants to be victorious. As Jake and Nicole work towards creating their respective olive oil submissions, while enjoying the annual Fall Festival as they do, they discover they may have more in common than they realized - and sparks begin to fly.

1957年某晚，居住在美国加州莫哈维沙漠小镇中的天文学家泰德•刘易斯博士（艾瑞克•麦柯马克 Eric McGormack 饰）正为爱妻拉娜（乔蒂•汤普森 Jody Thompson 饰）准备结婚周年纪念的烧烤晚餐，突然发现一颗流星从天而降坠毁在不远处的小山坡上。同样目睹流星飞过的还有小镇餐馆女服务员泰米（詹妮•拜尔德 Jenni Baird 饰）。泰德前去查看，发现“流星”竟是一艘外星飞碟，自己也被外星人“厄普”俯身。厄普在泰米的帮助下全力搜寻逃匿的独眼外星怪兽“格塔”，却依然赶不上“格塔”吃人的速度。更可怕的是，一旦“格塔”开始以几何级数速度分身，将陷整个地球于不可挽回的危险之中。

女主角本为一名专栏作家，却遭到所属的纽约出版社开除，丧志的她决定在圣诞前一週去拜访姊姊，帮忙姐姐经营烘焙房，黄金单身汉的编辑却意外出现，想弥补自己的错误。

公元2035年，是人和机器人和谐相处的社会，智能机器人作为最好的生产工具和人类伙伴，逐渐深入人类生活的各个领域，而由于机器人“三大法则”的限制，人类对机器人充满信任，很多机器人甚至已经成为家庭成员。
　　总部位于芝加哥的USR公司开发出了更先进的NS-5型超能机器人，然而就在新产品上市前夕，机器人的创造者阿尔弗莱德•朗宁博士却在公司内离奇自杀。
　　黑人警探戴尔•斯普纳（威尔•史密斯 饰）接手了此案的调查，由于不愉快的往事，斯普纳对机器人充满了怀疑，不相信人类与机器人能够和谐共处。他根据对朗宁博士生前在3D投影机内留下的信息分析和对自杀现场的勘查，怀疑对象锁定了朗宁博士自己研制的NS-5型机器人桑尼，而公司总裁劳伦斯•罗伯逊似乎也与此事有关。
　　斯普纳结识了专门研究机器人心理的女科学家苏珊•凯文(碧姬•奈娜汉 饰)，随着二人调查的深入，真相一步一步被揭露出来：机器人竟然具备了自我进化的能力，他们对“三大法则”有了自己的理解，他们随时会转化成整个人类的“机械公敌”。
　　斯普纳和凯文开始了对抗机器人的行动，一场制造者和被制造者之间的战争拉开序幕。