On "Vitamin D," the girls mashed up a pair of songs. Watch them perform "Walking on Sunshine" and "Halo" now.
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On the Glee episode "Vitamin D," the boys take on the girls. In this clip, the men mash up a Bon Jovi classic, "It's My Life."
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On Vitamin D, Glee's sixth episode, the boys face off against the girls. Watch the official promo for the episode now.
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Glee Season 1 Episode 6 Quotes

We're gonna win. You're gonna lose. Deal with it.

Finn [to Lea]

Terri: I'm the new school nurse.
Will: But you don't have any training.
Terri: Please, Will, it's a public school.