The basic premise of FlashForward is known by most TV fans at this point:

Simultaneously, the world's population goes unconscious and each individual flashes forward to the date April 29, 2010. Some see themselves as pregnant; others see nothing at all and fear that they are dead.

After two minutes and 17 seconds, everyone wakes up and wonders the same thing: WTF?!?

FBI agent Mark Benford even puts together The Mosaic Collective, his attempt to piece together what the heck is going on. For his sake, let's hope Mark tunes in to the conclusion of the September 24 series premiere.

Consider yourself warned, as we're about to reveal a major piece to the FlashForward puzzle:

• At the end of "No More Good Days," security camera footage is shown of the moment when the world blacks out. Everyone on the planet appears to drop like a fly at the same time... except for a mysterious man in black, who is shown walking around strewn bodies at a stadium in Detroit.

What does this mean? Who is that man? Like the rest of us, you'll need to tune in to FlashForward this fall and find out.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.