Steven Spielberg just confirmed that 'Disclosure Day' is the final instalment in a trilogy of films that took him decades to complete. His new film 'Disclosure Day' is being framed as the capstone of a thematic trilogy that began with 'Close Encounters of the Third Kind' and continued in 'E.

The main thing you need to know going into "Disclosure Day" is that Spielberg firmly believes aliens exist, although whether they've visited our planet at any point is another matter.