Joe Boyd, an aging Washington Senators fan, would sell his soul for the Senators to beat the New York Yankees and win the pennant. Enter Applegate (Ray Walston), who offers to turn Boyd into Joe Hardy (Tab Hunter), a powerful young baseball player, in exchange for his soul. When Boyd agrees, he becomes Hardy and leads the Senators on a winning streak. When he starts to miss his wife, though, and questions the deal, Applegate sends temptress Lola (Gwen Verdon) into the mix.