From YouTube - Recommended by Steve Hammons

This is obviously a promotional video but as Steve Hammons inquired: what were the sources for the video.

Dark Skies is an American sci-fi/drama television series which aired during the 1996-1997 season for 18 episodes plus a two-hour pilot episode. The success of The X-Files on the FOX Network proved there was an audience for genre shows, resulting in the NBC Network commissioning this proposed competitor following a pitch from producers Bryce Zabel and Brent Friedman. The series debuted September 21, 1996 on NBC, and was later rerun by the Sci-Fi channel. Its tagline was "History as we know it is a lie."

20th Century history as we know it is a lie. Aliens have been among us since the late 1940s, but a government cover-up has protected the public from such knowledge. As the series progresses, we follow John Loengard and Kim Sayers through the 1960s as they attempt to foil the plots of the alien Hive. The Hive is an alien race that planned to invade Earth through a manipulation of historical events and famous figures, including most notably the assassination of President John F. Kennedy. In addition, the pair must stay one step ahead of a covert government agency that has mixed motives, Majestic 12.
 

Read more about Dark Skies Click here.