Jack-4

Jack-4 (Tekken 5)
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.Several Jack-4's also appear in the Scenario Campaign Mode of Tekken 6, fighting for the G Corporation.Despite Jack-4 only appearing in Tekken 5, it's considered the Tekken 4-era Jack, since it first appears in the game's opening, set during the fourth tournament, and it's numbered "4". Jack-4 fills the lack of any Jack in Tekken 4, making later Jacks' number match the game's.