Guest roles on the series have featured actors such as: Gary Lockwood and Sally Kellerman in "Where No Man Has Gone Before"; Diana Muldaur in "Return to Tomorrow" and "Is There in Truth No Beauty?"; Ricardo Montalbán as Khan Noonien Singh in "Space Seed."
Gary Lockwood og Sally Kellerman i "Where No Man Has Gone Before"; Diana Muldaur i "Return to Tomorrow" og "Is There in Truth No Beauty?"; Ricardo Montalbán som Khan Noonien Singh i "Space Need".