|Fighting Style||Brute Force|
|Last Appearance||Tekken Tag Tournament|
Prototype Jack (or P.Jack for short), the only Jack to fight in more than one King of Iron Fist Tournament, appeared in both Tekken and Tekken 2, as well as Tekken Tag Tournament. He was created by to fight both Jack and Jack-2, and was destroyed by Jack-2. Unlike the rest of the Jacks, he's a different robot.