Prototype Jack

Prototype Jack (プロトタイプ・ジャック Purototaipu Jakku?, in Russian: Прототип Джек) (P. Jack for short) is a playable robot in the Tekken series of fighting games. Prototype Jack was created and designed by Doctor Bosconovitch as the prototype model of the main Jack series. However, after it was stolen by Heihachi Mishima, it was pitted against the main line of Jacks.
In search of a new, more devastating, weapon, the Russian military began work on the development of androids - superhuman robots built for the purpose of causing destruction. The first step in production was the prototype model of what was to become a line of military robots, which were named "Jack". The prototype was stolen by Heihachi Mishima and his Mishima Zaibatsu, but Russia was still able to produce their main line of Jack robots without the prototype at hand. With the project a success, the first Jack was entered into the King of Iron Fist Tournament. On learning of this, Heihachi entered Prototype Jack into the tournament to face its upgraded counterpart. Prototype Jack was ultimately destroyed by Jack. A couple of years later, the genius Russian scientist, Doctor Bosconovitch, was kidnapped by the new CEO of the Zaibatsu, Kazuya Mishima. Bosconovitch repaired and updated Prototype Jack. After being remodeled and gaining new abilities, Prototype Jack was entered into the second tournament as a rival to the upgraded Jack robot, Jack-2.
It is unknown what happened to Prototype Jack after this. In the non-canonical Tekken Chronicle, some of Prototype Jack's parts, along with parts from Jack and Jack-2, were used in the creation of Gun Jack. Given that Gun Jack inherited some of Prototype Jack's moves, and was partially built in Mishima Industries where Prototype Jack received its upgrades, it is possible that canonically its remains were indeed dismantled and used in the creation of Gun Jack.
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