这一次，破坏王拉尔夫（约翰·C·赖利 John C. Reilly 配音）和云妮洛普（萨拉·丝沃曼 Sarah Silverman 配音）又闯祸了，导致了云妮洛普所在的游戏《甜蜜冲刺》的游戏机方向盘遭到了损坏。这是一台非常古老的街机，在整个互联网中，只有一只备用方向盘正在销售，然而它的售价实在是非常昂贵，老板决定放弃这台机器，将它解体变卖。这也就意味着，《甜蜜冲刺》里的角色们将永远失去他们的家园。为了避免这一悲剧的发生，拉尔夫和云妮洛普决定亲自到互联网里去走一遭，买回方向盘。一路上，他们惹了无数的笑料，犯了无数令人啼笑皆非的错误。为了赚钱，拉尔夫不惜亲自出马成为视频网站的网红赚取点击量变现，而云妮洛普则在另一款赛车游戏《狂野飙车》里找到了真正的自我。
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