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GLEE Season 4 Episode 20 Lights Out Photos : When the power goes out at McKinley High, Will and Finn enlist the members of New Directions to “unplug” and perform acoustic numbers. Meanwhile, Isabelle Wright (guest star Parker) asks Kurt to volunteer at the Vogue.com charity event, with Rachel and Santana in tow, in the all-new “Lights Out” episode of GLEE airing Thursday, April 25 (9:00-10:00 PM ET/PT) on FOX. (GLE-420) (TV-14 D, L)