Steven Spielberg's Disclosure Day has finally arrived, giving us another great alien movie from the legendary director. Where does it rank, though?

Spielberg has graced the silver screen with countless creative alien species in his career, and some have shown to be more threatening than others.

These wildly different films explore the wondrous, and sometimes terrifying possibilities of contacting extra-terrestrial life.

With 'Disclosure Day,' the director returns to a longtime preoccupation. Two Times staffers explore his ongoing fascination with extraterrestrials.