They do not sing it, they just perform to it. it is the episode, Season 2 Episode 11 Thriller
Season 2
The episode is called "The Sue Sylvester Shuffle" and they sing it at half time in the football game. It's actually a combination of Thriller and Rolling heads. (well, I think it's called rolling heads, or something like that). But if you haven't seen it, its really good
Every single episode. That is somewhat of a stupid question. He is in the glee club. He must sing. lolz. :)
The Glee Episode In Which Finn Happens To Sing Jesse's Girl To Rachel Is Laryngitis
Episode 4
They sang it on the episode called On My Way
Special Education
like every...
Dream On.
no
episode 3 "Acafellas"