She first appears in episode "Children Will Listen". She decides to stay with Susan indefinitely after alleging that her boyfriend, Morty Flickman (Bob Newhart), became violent during an argument. Her visit becomes an imposition for Susan, as Sophie continually flirts with strange men and tries to set up double dates for her and Susan. Eventually, Sophie and Morty reconcile and become engaged. Their wedding takes place, when Sophie admits to Susan that her father did not die in the Vietnam War and is actually local businessman Addison Prudy (Paul Dooley), with whom Sophie had an affair while working as his secretary. Sophie reappears in the seventh season episode "Where Do I Belong?", while Susan is in the hospital awaiting a kidney transplant. Susan feels betrayed when Sophie does not volunteer to be her kidney donor; however, Susan soon discovers that Sophie has breast cancer and does not want Susan to know because she is trying to make up for years of being self-centered.