Too often movie trailers are just a mini-version of the film, giving everything important away, but the ones on this list prove they can still be a work of art.

Steven Spielberg's UFO movie 'Disclosure Day' has been revealed in a new trailer starring Emily Blunt and Josh O'Connor.

Spielberg is the director of Disclosure Day, marking his return to the alien genre since his 2005 film War of the Worlds.