Leverage Season 3 Episode 1 (Leverage s03e01) with title “The Jailhouse Job” airs on Sunday, June 20th 2010 at 09:00 pm via TNT Network.
Here is summary for Leverage Season 3 Episode 1 :

In order to save the life of an innocent inmate, Nate must bring down the corrupt warden of the Super-Max prison where he’s currently incarcerated and escape… whether he wants to or not.

Few hours after original series aired on TV, online streaming video for Leverage Season 3 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.