Jax is a fictional character from the Mortal Kombat fighting game series. Since his playable debut in Mortal Kombat II as the physically-imposing United States Special Forces superior of Sonya Blade, he has become a mainstay in the series canon, appearing in nearly every subsequent series installment, in addition to being the protagonist of the action-adventure spinoff title Mortal Kombat: Special Forces, and was one of the eleven characters representing the series in the crossover game Mortal Kombat vs. DC Universe. His most distinctive features in the game are his metal bionic arms, which first appeared in Mortal Kombat 3.