Tim Stack
May 11, 2012 AT 10:10 PM EDT

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…

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