Watch! Chord Overstreet's Sam and Amber Riley's Mercedes Sing Grease's Summer Nights in Glee Season 3, Episode 10: "Yes/No" [VIDEO] Share Tweet January 18, 2012 by Beth Douglass Related: Glee, Music, Amber Riley, Chord Overstreet, Mercedes Jones, Sam Evans, Season 3 Episode 10 Original Air Date: January 17, 2012, 8/7c
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