Ben attempts to prove to Danny that his relationship with Riley was real, leading to awkward tension between Danny and Riley. Meanwhile, Bonnie flirts with someone in a position of power to further her own agenda; and Tucker rekindles an old romance.

Baby Daddy follows Ben, a young man in his early 20s living the life of a bachelor in New York City with his buddy, Tucker, and his brother, Danny. Their lives are turned upside down when they come home one day to find a baby girl left on the doorstep by an ex-girlfriend of Ben's. After much deliberation, Ben decides to raise the baby with the help of his friends and his protective and sometimes over-bearing mother, Bonnie, and his close female friend, Riley.