- William Shatner as Romulan Imposter in The Enterprise Incident
- Grace Lee Whitney as Yeoman Janice Rand in Charlie X
- Venita Wolf as Yeoman Ross in The Squire of Gothos
- Lou Antonio as Lokai in Let That Be Your Last Battlefield
- Andrea Dromm as Yeoman Smith in Where No Man Has Gone Before
- Biff Elliot as Schmitter in The Devil in the Dark
- Craig Huxley as Peter Kirk in Operation: Annihilate!
- Craig Huxley as Tommy Starnes in And the Children Shall Lead
- Richard Evans as Isak in Patterns of Force
- Irene Kelly as Sirah in The Omega Glory
- James X. Mitchell as Lt. Josephs in Journey to Babel
- Joanna Linville as Romulan Commander in The Enterprise Incident
- Phil Morris as Onlie Boy in Miri
- Iona Morris as Onlie Girl in Miri
- Lisabeth Shatner as Onlie Girl in Miri
- Felix Silla as Talosian in The Cage
- Billy Blackburn as Lt. Hadley in Return to Tomorrow
- Billy Blackburn as White Rabbit in Shore Leave
- Julie Cobb as Yeoman Leslie Thompson in By Any Other Name
- Bob Herron as Kahless The Unforgettable in The Savage Curtain
- Deborah Downey as Mavig in The Way to Eden
- Louise Sorel as Rayna Kapec in Requiem for Methuselah
- Barbara Baldavin as Ensign Martine in Balance of Terror/Turnabout Intruder
- Bruce Mars as Charley in Assignment: Earth
- Bob Herron as Sam in Charlie X
- Sean Morgan as Lt. O'Neill in Return of the Archons
- Sean Kenney as Lt. DePaul in A Taste of Armeggedon
- Majel Barrett as Nurse Chapel in Turnabout Intruder
- Arnold Lessing as Lt. Carlyle in The Changeling
- Win De Lugo as Lt. Timothy in Court Martial
- Vince Deadrick, Sr. as Lt. Matthews in What Are Little Girls Made of?
- Michael Dante as Maab in Friday's Child
- Perry Lopez as Esteban Rodriguez in Shore Leave
- BarBara Luna as Lt. Marlena Moreau in Mirror, Mirror
- Jan Shutan as Lt. Mira Romaine in The Lights of Zetar
- Stewart Moss as Hanar in By Any Other Name
- Celeste Yarnall as Yeoman Landon in The Apple
- Yvonne Craig as Martain Whom Gods Destroy
- Fred Williamson as Anka in The Cloud Minders
- Leslie Parrish as Lt. Palamas in Who Mourns for Adonais?
- Dave Somerville as Lt. Larry Matson in The Conscience of the King
- Pamelyn Ferdin as Mary Janowski in And the Children Shall Lead
- Michael Pataki as Korax in The Trouble with Tribbles
- Sid Haig as First Lawgiver in The Return of the Archons
- Melvin Caesar as Belli Steve in And The Children Shall Lead
- Steve Marlo as Zabo in A Piece of the Action
- Erik Holland as Ekor in Wink of an Eye
- Lloyd Kino as Wu in The Omega Glory
- Derek Partridge as Dionyd in Plato's Stepchildren
- Jerry Ayres as Ensign O'Herlihy in Let The Be Your Last Battlefield
- Louie Elias as Engineering Technician in And the Children Shall Lead
- James Daris as Morg in Spock's Brain
- Marj Dusay as Kara in Spock's Brain
- Bonnie Beecher as Sylvia in Spectre of the Gun
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