|Relationships||Bryan Fury (owner)|
|Fighting Style||Pre-programmed combat|
|Debut||Street Fighter X Tekken|
- "Beginning scheduled maintenance."
A powerful robot that responds only to the orders of its master. It serves as a backup to the JACK-6 line of robots. It possesses superior attack range and power, and is also equipped with several high-powered all-range attacks.
- In Bryan and JACK-X's rival dialogue, the latter scans Guy and Cody and states that their power level is over nine thousand, a reference to a popular Internet meme, originating from the Dragonball manga and anime series.
- In the game, JACK-X is taller than Marduk, Sagat and Zangief but still smaller than Kuma and Hugo, which means JACK-X is the 3rd tallest character, standing at 7'8 tall.
- JACK-X is much taller than the average Jack androids, standing at 6'9.