Lewis is a smart 12-year-old boy who has a long list of clever inventions to his credit. His latest and most ambitious project is the Memory Scanner, a machine that will help him find his birth mother and have a family again. But before finding her, the evil Bowler Hat Guy and Doris, his devilish and inseparable hat, steal her invention. But Lewis does not lose hope and meets a mysterious boy named Wilbur Robinson, who proposes to our bewildered hero a journey back in time to spend a day with Wilbur's eccentric family. In a world full of flying cars and floating cities, they will strive to hunt down Bowler Hat Guy, save the future, and unveil the amazing secret of the Robinson family