It's October, and you know what that means.... Halloween episodes!! So naturally Glee's destination for the month is "horror" (sorry Sue, stole your line). Check out the episode title for said spooky episode, which also happens to be episode 5:
Glee Season 2 Episode 5 - "The Rocky Horror Glee Show"
Make sure you also head over to our sister site, Glee-Soundtrack to check out the news music-wise for the Rocky Horror Picture Show spoof (and when you can get your hands on the CD).