'Glee' scoop: [SPOILER] gets sick! [SPOILER] has to fill in! -- EXCLUSIVE VIDEO | EW.com

TV | Inside TV

'Glee' scoop: [SPOILER] gets sick at Nationals! [SPOILER] has to step in to replace! -- EXCLUSIVE VIDEO

New Directions is finally heading to Nationals in next week’s two-hour episode of Glee. But, judging from this exclusive clip from Tuesday’s installment, Nationals is gonna be no walk in the park when – SPOILER ALERT – Mercedes (Amber Riley) comes down with a nasty bug. Will (Matthew Morrison) decides that Quinn (Dianna Agron) and Tina (Jenna Ushkowitz) have to join the Troubletones to make up for the vocal loss. Meanwhile, Sue takes a cue from the 1990 flick Jacob’s Ladder (awesome reference) and prepares an ice bath! Watch below…

Follow Tim on Twitter: @EWTimStack