Mary Tyler Moore is profiled. The episode examines her days with “The Dick Van Dyke Show” and her classy self-titled 1970s sitcom; and delves behind the scenes to detail her off-screen life, which includes two failed marriages, battles with alcoholism and diabetes, and the death of her son. Insights are provided by Dick Van Dyke; Carl Reiner; Gavin MacLeod; Betty White; TV GUIDE's Ileane Rudolph; and, via archival clips, Moore's ex-husband Grant Tinker and Moore.