Long ago, a group of people named the Shadow Army used their Dark Master creatures to try and conquer all. Then another group of creatures named the Guardians stopped the Dark Masters, and imprisoned them and themselves inside Duel Monster cards. In modern times, Archie Rhodes finds out that he has been fostered by a family named the Robinsons because his parents were killed by the Shadow Army. Archie Rhodes then runs away from home in hopes of finding the Shadow Army to seek his revenge. It is then, a mysterious man gives Archie Rhodes a Guardian card, he becomes a Keeper and gets his Keeper mark. Archie then gathers the 3 definite Keepers and his friends, to then set off to defeat the Shadow Army.