Every time someone releases a documentary about UFOs, we secretly hope this is the one with the smoking gun that changes the world and proves aliens exist. Well, we don’t think Unacknowledged does that, but it’s not lacking in fascinating conspiracy theories.

Directed by Michael Mazzola, Unacknowledged follows Dr. Steven Greer, who takes viewers through what he believes is a well-documented history of the United States covering up the existence of evidence of extraterrestrials.

One example is in this exclusive clip, which suggests Marilyn Monroe was killed because she threatened to leak classified information.