Persons Unknown Season 1 Episode 1 (Persons Unknown s01e01) airs on Monday, June 7th 2010 at 10:00 pm via NBC Network.
Here is summary for Persons Unknown show :

A surreal mind-game of a series centering on a group of strangers who awaken in a deserted town with no memory of how they arrived, only to realize that there is no escape… Read full summary on NBC

Few hours after original series aired on TV, online streaming video for Persons Unknown Season 1 Episode 1 usually available on Net and of course, if video available, as soon as possible will show you where you can watch this episode for free.