Flash Forward Season 1 Episode 22 (Flash Forward s01e22) with title “Future Shock” airs on Thursday, May 27th 2010 at 08:00 pm via ABC.
Here is summary for Flash Forward Season 1 Episode 22 :

It’s D-Day – April 29, 2010 – and while everyone waits to see if their flashforward visions come true, Mark uncovers the date of the next blackout, and also Simon, with Demetri, tries to stop it from happening by breaking into the NLAP mainframe.

Few hours after original series aired on TV, online streaming video for Flash Forward Season 1 Episode 22 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.