Peter Hatten (played by Stephen Collins) is a protagonist in Threesome.
Barbara Jones (played by Deborah Raffin) appears in Threesome.
Dan Shaper (played by Joel Higgins) appears in Threesome.
Mr. Jones (played by Addison Powell) appears in Threesome.
Laura Shaper (played by Dana Delany) appears in Threesome.
Gloria (played by Susan Hess) appears in Threesome.
Mrs. Larkin (played by Eleanor Phelps) appears in Threesome.
Harry (played by W.T. Martin) appears in Threesome.
