Two weeks after Sunset Shimmer's little accident with a stuck shower room door, Principal Celestia announces a fundraiser: a bikini marathon, open to all junior and senior girls as well as all female faculty members. It's a chance for all the sexy girls of CHS to show off their bodies a little bit and have some fun for a good cause.

But a last-minute rule change raises the stakes for all the participants, and turns a friendly, sexy fundraiser into an all-out war for dignity.