Contract J.A.C.K. is a stand-alone expansion pack to the 2002 computer game No One Lives Forever 2: A Spy In H.A.R.M.'s Way. It was developed by Monolith Productions, published by VU Games, and was released on November 11, 2003. J.A.C.K. (Just Another Contract Killer) is set in the time frame between the events of the original No One Lives Forever and No One Lives Forever 2.
The game follows John Jack, a professional killer recruited by H.A.R.M., a criminal organization central to the No One Lives Forever series. Contract J.A.C.K. is set between No One Lives Forever and No One Lives Forever 2. The game does not involve UNITY, the organization for which Cate Archer works and that opposed H.A.R.M. in the other two games. Rather, J.A.C.K. pits H.A.R.M. against a rival criminal organization, Danger Danger.