Many actors guest-starred on the show; some were relatively unknown at the time and became successful stars in their own feature films or television series. Guest stars included: Dean Stockwell, Pernell Roberts, Edmond O'Brien, Ricky Nelson, Ron Glass, Susan Dey, Marion Ross, Van Williams, Paula Kelly, Don Johnson, Tom Selleck, Leslie Nielsen, James Woods, Nick Nolte, Arnold Schwarzenegger, Martin Sheen, Dabney Coleman, David Wayne, Vera Miles, Brenda Vaccaro, Desi Arnaz, Jr., Tony Young, Cal Bellini, Marshall Colt, Pat Conway, Patty Duke, Denver Pyle, Richard Egan, Richard Eastham, Rodolfo Hoyos, Jr., Don Keefer, Wright King, Flip Mark, Nora Marlowe, John Ritter, Stefanie Powers, Robert Wagner, Wayne Maunder, Dick Van Patten, Mark Hamill, Tom Bosley, Larry Hagman, Tim O'Connor, Anthony Geary, John Davidson, Eve McVeagh, Andrew Robinson, Beverly Washburn, Bill Bixby, Charles Aidman, Edward Mulhare, Jessica Walter, Len Birman, Michael Constantine, Norman Fell, Richard Bull, William Windom, David Soul, Paul Michael Glaser, Bernie Kopell, Claude Akins, Dennis Cole, Doris Roberts, Earl Holliman, Gerald McRaney, Howard Duff, John Saxon, Larry Pennell, Ned Beatty, Gary Lockwood, Kay Lenz, Laurie Heineman, Lew Ayres, Luther Adler, Maureen McCormick, Meredith Baxter, Michael Ansara, Noah Beery, Jr., Paul Sorvino, Richard Anderson, Albert Salmi, Celeste Holm, David White, Dick Sargent, Geoffrey Lewis, Jack Albertson, Jamie Farr, Joe Santos, Joseph Cotten, Robert Reed, Roger E. Mosley, Stuart Whitman, Carl Weathers, Cheryl Ladd, Clint Howard, Gordon Jump, Herbert Jefferson, Jr., Martin Kove, Sam Elliott, Tommy Kirk, Tyne Daly, Vic Morrow and Victor French, among many others. Even Michael Douglas's own mother, Diana Douglas, guest-starred in a season two episode, "Chapel of the Damned". Character actor Robert F. Simon appeared eight times as Captain Rudy Olsen. Gary Vinson appeared toward the end of his career.