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Jack is the name of a series of robots in the Tekken franchise. Though Jack has many names and designations they all share the same memories except for Jack-5 as Gun Jack loses his memories in Tekken 3 and Jack-6 does not regain them until Tekken 6. Jack's rival was Prototype Jack, a prototype version of himself. During Tekken 2, Jack-2 saved and befriended a 8 year old girl named Jane, who would later grow up to be a scientist and kept developing Jack. Adult Jane works for Kazuya Mishima and created an army of Jacks for the G-Corporation.
Jane successfully restored Jack-5's memory at the completion of the 5th King of Iron Fist Tournament. It was not long until the Mishima Zaibatsu decided to make their own Jack model, which has been built with 10 times the power of Jack 5. The new G-Corporation leader Kazuya Mishima also demanded a new Jack model eventually creating Jack-6. They decided to test Jack 6 in the King of Iron Fist Tournament 6 to destroy the Mishima Zaibatsu.