Jack-4 is a non-playable character in the Tekken series of fighting games. This version was mass-produced and sent to attack Heihachi Mishima and Kazuya Mishima at Hon-Maru. Apparently, this model has a self-destruct feature, as shown in the Tekken 5 opening movie, where a Jack-4's head opens up to reveal an internal time bomb. The massive explosion wasn't enough to kill Heihachi, but the blast did however throw him several miles as well as free Jinpachi Mishima from his imprisonment.
There is no Jack model, not even Jack-4, participating in The King of Iron Fist Tournament 4, and Jack-4's successor, Jack-5, takes his place in The King of Iron Fist Tournament 5
Several Jack-4's also appear in the Scenario Campaign Mode of Tekken 6, fighting for the G-Corporation.
- Developed by Jane.
- Attacked Kazuya Mishima and Heihachi Mishima at Hon-Maru.
- Attacked Raven, possibly in an attempt to discard the only eye witness.
- The explosion caused by the Jack-4s freed and resurrected Jinpachi Mishima.
- The explosion caused by the Jack-4s was thought to have killed Heihachi Mishima, but Heihachi managed to survive.