Six years after saving the arcade from Turbo's revenge, the story continues with Wreck-It Ralph and Vanellope von Schweetz who now live a comfortable life, with Ralph content but Vanellope longing for excitement. Suddenly, the arcade owner, Mr. Litwak, introduces a Wi-Fi router, leading to unforeseen possibilities. When Vanellope's game "Sugar Rush" is in danger of being unplugged due to a broken steering wheel, the friends decide to venture into the uncharted world of the Internet in order to find the part needed to fix her game and save her home.

Navigating through this vast, new world, the duo quickly learn the rules of the Internet, which include dealing with pop-up ads, search engines, and online auctions. Their quest leads them to the expansive, bustling website "eBay," where they must win an auction for the rare steering wheel. Ralph and Vanellope must find a way to earn the in-game currency needed to pay for their purchase, which introduces them to new environments and characters, including the tough and talented Shank from the gritty online racing game "Slaughter Race," and an algorithm named Yesss, who is the embodiment of a trend-making site called "BuzzzTube.