Mourning Becomes Electra is a play cycle by Eugene O'Neill that retells the Greek tragedy Oresteia. It features themes of murder, adultery, incestuous love and revenge between members of a wealthy New England family in the aftermath of the Civil War. The play explores Freudian concepts of the Oedipus complex through the relationships between characters, particularly the incestuous love of Lavinia for her father that mirrors an Electra complex.