That's Wednesday, Oct. 14, 2009 at 10pm (Eastern and Pacific Time) or 9pm Central Time. If you miss it, no sweat: It will no doubt be repeated... and repeated.
The main new thing about this episode is the first-ever televised visit to the abandoned Green River Missile complex in Utah (named as the "New Area 51" by Popular Mechanics a few years back). We will be sneaking around in underground facilities there and discovering (as you might have guessed) no new Area 51 there.
The episode filmed back in June. To bring you up to speed, here is my photo album of the shoot. Also check out this blog regarding the previous UFO Hunters show and Green River.