Glee Season 1 Episode 21 (Glee s01e21) with title “Funk” airs on Tuesday, June 1st 2010 at 08:59 pm via FOX.
Here is summary for Glee Season 1 Episode 21 :

The glee club gets some jarring news. Meanwhile, Will gets revenge on Sue (for the time being). Elsewhere, Quinn connects with her “funky” side, with some help from Mercedes.

Few hours after original series aired on TV, online streaming video for Glee Season 1 Episode 21 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.