The Baxter is a made up word for the "wrong guy" of romantic comedy. The film chronicles the chaotic two weeks prior to the wedding of Elliot Sherman (Michael Showalter
), an obsessive, repressive accountant with an encyclopedic knowledge of his own ailments. Elliot is the quintessential Baxter - a guy who never actually gets the girl. He has been passed over so many times that his deepest neurosis is that he is destined never to end up with the girl of his dreams (and there have been several).
Elliot can hardly believe his good fortune, having landed Caroline (Elizabeth Banks), who is beautiful, sophisticated and, more importantly, on the rebound. As wedding preparations reach levels of frenetic proportions, out of the blue appears Bradley (Justin Theroux), fresh from adventures in exotic places, once Caroline's great love, thought to be lost and now found!
Thrown into a state of turmoil, Elliot turns to his eccentric new office temp, Cecil (Michelle Williams), for some solid female advice.