Tom Cruise will save the world from aliens — not on the big screen but in real life.

His day job as an actor pales next to the billion-year contract of service he signed with the Church of Scientology, according to a bombshell new book, “Going Clear: Scientology, Hollywood & The Prison of Belief.” New Yorker writer Lawrence Wright details Cruise’s demigod status within the church, as well as the group’s ultimate purpose — protect humanity from aliens living in our bodies, who are bent on destroying us and ultimately the planet.