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Season 4 Episode 18
"The members of New Directions are prepping for Regionals, but when an unthinkable event occurs at McKinley High, perspectives are put into order."
Original airdate: Thursday, April 11, 2013 at 9pm on FOX
The exact nature of this "unthinkable event" is still a closely-guarded secret, but rumors are flying that it could be a school shooting. If that does end up being the case, we certainly are in for one heck of an emotional night.