eXistenZ is a 1999 psychological thriller/science fiction film by Canadian director David Cronenberg. It stars Jennifer Jason Leigh and Jude Law.

Andras Hamori and Robert Lantos (two producers of the film who are both of Hungarian origin) said in an interview that they intentionally hid a pun in the title: "isten" is the word for "God" in Hungarian. This is why the X and Z are capitalized in the title of eXistenZ, to single out the word "isten".

Allegra Geller, the leading game designer in the world, is testing her new virtual reality game, eXistenZ with a focus group. As they begin, she is attacked by a fanatic assassin employing a bizarre organic gun. She flees with a young marketing trainee, Ted Pikul, who is suddenly assigned as her bodyguard. Unfortunately, her pod, an organic gaming device that contains the only copy of the eXistenZ game program, is damaged. To inspect it, she talks Ted into accepting a gameport in his own body so he can play the game with her. The events leading up to this, and the resulting game lead the pair on a strange adventure where reality and their actions are impossible to determine from either their own or the game's perspective. Written by Kenneth Chisholm