Will challenges the kids to a healthy dose of competition with boys against girls in a mashup showdown. Meanwhile, Terri takes a job as the school nurse, despite having no medical experience, to keep an eye on Will.

Inspired the by the students, Will composes a mash-up for a very special occasion. Meanwhile, in a shocking reversal of roles, McKinley High's cool kids are dethroned in an "icy" fashion, and Sue shows off her softer side.