In high school, Marley Rose was never the most popular, the prettiest, or the one with all the boyfriends. Those roles were given to her three so-called best friends, Brittany Pierce, Quinn Fabray, and Santana Lopez. Who would expect for her to be the one to find love and settle down first? Certainly not them. Flying in from all parts of the country, they're expected to be Marley's bridesmaids for her wedding. But what's a wedding without a party beforehand? The Unholy Trinity is in charge of doing what they do best: hosting the extravagant bash for their ex-friend, but not without a few bumps in the road when they realized who the groomsmen are.