Conspiracy X is a modern horror role-playing game set in a world where aliens, monsters and the supernatural exists. Originally published by New Millennium Entertainment in 1996, it has seen two editions produced by its current owner, Eden Studios in addition to a GURPs edition (released by Steve Jackson Games).
In Conspiracy X, the players take on the roles of agents working for AEGIS, a secret American government agency tasked with hiding the truth of the world from the rest of humanity. In this they battle against the machinations of extraterrestrial invaders, the occult and the supernatural.
More information on this game can be found here.