Lewis is a brilliant twelve-year-old boy with a surprising number of clever inventions to his credit. His latest and most ambitious project is the Memory Scanner, which he hopes will retrieve early memories of his biologic mother and maybe even reveal why she put him up for adoption. But before he can get his answer, his invention is stolen by the dastardly Bowler Hat Guy and his diabolical hat - and constant companion - Doris.

Lewis does not give up hope in his future when he meets a mysterious boy named Wilbur Robinson who suggests this hero to travel in a time machine and the two travel forward in time to spend a day with Wilbur's eccentric family. In a world filled with flying cars and floating cities, they hunt down Bowler Hat Guy, save the future and uncover the amazing secret of Lewis' family.