 The series was notable for featuring younger and/or lesser-known/little-known actors, some of whom became major stars, including Alan Alda, Michael Ansara, Ed Asner, Martin Balsam, Barbara Barrie, Orson Bean, Robert Blake, James Caan, Godfrey Cambridge, Joseph Campanella, Diahann Carroll, James Coburn, Michael Constantine, William Daniels, Sandy Dennis, Bruce Dern, David Doyle, Keir Dullea, Robert Duvall, Peter Falk, James Farentino, Peter Fonda, Conard Fowkes, Eileen Fulton, Frank Gorshin, Harry Guardino, Gene Hackman, Barbara Harris, Dustin Hoffman, Dennis Hopper, Diana Hyland, Richard Jaeckel, David Janssen, Salome Jens, Jack Klugman, Shirley Knight, Piper Laurie, Diane Ladd, Audra Lindley, Jack Lord, George Maharis, Nancy Marchand, Sylvia Miles, Vic Morrow, Barry Morse, Robert Morse, Lois Nettleton, Leslie Nielsen, Carroll O'Connor, Susan Oliver, Marisa Pavan, Suzanne Pleshette, Robert Redford, Doris Roberts, Mark Rydell, Telly Savalas, George Segal, William Shatner, Martin Sheen, Jean Stapleton, Maureen Stapleton, Rod Steiger, Mel Stuart, Rip Torn, Cicely Tyson, Brenda Vaccaro, Dick Van Patten, Jon Voight, Christopher Walken, Deborah Walley, Jack Warden, Tuesday Weld, and Dick York.The show also featured more established and/or better-known actors, including Luther Adler, Eddie Albert, Robert Alda, Louise Allbritton, Kirk Alyn, Richard Basehart, Theodore Bikel, Nancy Carroll, Lee J. Cobb, Gladys Cooper, Hume Cronyn, Ludwig Donath, Diana Douglas, Betty Field, Geraldine Fitzgerald, Nina Foch, Ruth Ford, Martin Gabel, Peggy Ann Garner, Vincent Gardenia, Eileen Heckart, Barnard Hughes, Kim Hunter, Sam Jaffe, Glynis Johns, Kurt Kasznar, Abbe Lane, Eugenie Leontovich, Al Lewis, Viveca Lindfors, Ross Martin, Walter Matthau, Myron McCormick, Roddy McDowall, Burgess Meredith, Jean Muir, Meg Mundy, Mildred Natwick, Cathleen Nesbitt, Jeanette Nolan, Nehemiah Persoff, Claude Rains, Eugenia Rawls, Aldo Ray, Ruth Roman, Mickey Rooney, Albert Salmi, George C. Scott, Sylvia Sidney, Jan Sterling, Beatrice Straight, Akim Tamiroff, Lawrence Tierney, Jo Van Fleet, Eli Wallach, David Wayne, Jesse White, Cara Williams, Roland Winters, and Keenan Wynn.Many of the actors listed above played multiple roles for different episodes, as different characters.