De volgende lijst is een opsomming van alle belangrijke terugkerende personages optredens van Star Trek: The Original Series.
Brent[]
Brent, gespeeld door Frank da Vinci
- "The Corbomite Maneuver" • "The Man Trap" • "The Naked Time" • "The Galileo Seven" • "Court Martial" • "Arena" • "The Alternative Factor" • "Tomorrow is Yesterday" • "A Taste of Armageddon" • "Space Seed" • "The Changeling" • "The Deadly Years" • "Bread and Circuses" • "The Gamesters of Triskelion" • "The Immunity Syndrome" • "A Piece of the Action" • "By Any Other Name" • "Return to Tomorrow" • "The Ultimate Computer" • "Spock's Brain" • "Is There in Truth No Beauty?" • "The Tholian Web" • "Let That Be Your Last Battlefield" • "Whom Gods Destroy" • "The Lights of Zetar" • "The Mark of Gideon" • "The Way to Eden"
Chapel, Christine[]
Christine Chapel, gespeeld door Majel Barrett
- "The Naked Time" • "What Are Little Girls Made Of?" • "Operation -- Annihilate!" • "Amok Time" • "The Changeling" • "The Deadly Years" • "Journey to Babel" • "A Private Little War" • "Obsession" • "The Immunity Syndrome" • "By Any Other Name" • "Return to Tomorrow" • "Elaan of Troyius" • "The Paradise Syndrome" • "The Enterprise Incident" • "And the Children Shall Lead" • "Spock's Brain" • "The Tholian Web" • "For the World is Hollow and I Have Touched the Sky" • "Plato's Stepchildren" • "Wink of an Eye" • "Let That Be Your Last Battlefield" • "The Lights of Zetar" • "The Way to Eden" • "Turnabout Intruder"
DeSalle[]
DeSalle, gespeeld door Michael Barrier
Farrell, John[]
John Farrell, gespeeld door Jim Goodwin
- "The Enemy Within" • "Mudd's Women" • "Miri"
Galloway[]
Galloway, gespeeld door David L. Ross
- "Miri" • "A Taste of Armageddon" • "The Galileo Seven" • "The Return of the Archons" • "The City on the Edge of Forever" • "The Trouble with Tribbles" • "The Omega Glory" • "Turnabout Intruder" • "Trials and Tribble-ations"
Grayson, Amanda[]
Amanda Grayson, gespeeld door Jane Wyatt
Hadley[]
Hadley, gespeeld door William Blackburn
- "The Alternative Factor" • "A Piece of the Action" • "The Doomsday Machine" • "By Any Other Name" • "Obsession" • "Whom Gods Destroy" • "That Which Survives" • "Requiem for Methuselah" • "Is There in Truth No Beauty?"
Hansen[]
Hansen, gespeeld door Hagan Beggs
Harper[]
Harper, gespeeld door Sean Morgan
Kang[]
Kang, gespeeld door Michael Ansara
Kelowitz[]
Kelowitz, gespeeld door Grant Woods
- "The Galileo Seven" • "Arena" • "This Side of Paradise"
Koloth[]
Koloth, gespeeld door William Campbell
Komack[]
Komack, gespeeld door Byron Morrow
Kor[]
Kor, gespeeld door John Colicos
Kyle[]
Kyle, gespeeld door John Winston
- "Tomorrow is Yesterday" • "Space Seed" • "The City on the Edge of Forever" • "This Side of Paradise" • "Operation -- Annihilate!" • "Who Mourns for Adonais?" • "Wolf in the Fold" • "The Doomsday Machine" • "The Apple" • "Catspaw" • "The Immunity Syndrome" • "Mirror, Mirror" • "The Lights of Zetar"
Lemli, Roger[]
Roger Lemli, gespeeld door Roger Holloway
- "Who Mourns for Adonais?" • "The Changeling" • "Mirror, Mirror" • "The Deadly Years" • "I, Mudd" • "The Trouble with Tribbles" • "Bread and Circuses" • "A Private Little War" • "The Gamesters of Triskelion" • "A Piece of the Action" • "By Any Other Name" • "Return to Tomorrow" • "The Ultimate Computer" • "Spectre of the Gun" • "Elaan of Troyius" • "The Paradise Syndrome" • "The Enterprise Incident" • "And the Children Shall Lead" • "Spock's Brain" • "Is There in Truth No Beauty?" • "The Empath" • "The Tholian Web" • "Day of the Dove" • "Wink of an Eye" • "That Which Survives" • "Let That Be Your Last Battlefield" • "Whom Gods Destroy" • "The Lights of Zetar" • "The Way to Eden" • "Requiem for Methuselah" • "The Savage Curtain" • "Turnabout Intruder"
Leslie[]
Leslie, gespeeld door Eddie Paskey
- "Where No Man Has Gone Before" • "The Corbomite Maneuver" • "The Enemy Within" • "The Man Trap" • "The Naked Time" • "Charlie X" • "Balance of Terror" • "What Are Little Girls Made Of?" • "Dagger of the Mind" • "Miri" • "The Conscience of the King" • "The Galileo Seven" • "The Menagerie, Deel I" • "Shore Leave" • "The Squire of Gothos" • "The Alternative Factor" • "Tomorrow is Yesterday" • "The Return of the Archons" • "Space Seed" • "This Side of Paradise" • "The Devil in the Dark" • "Errand of Mercy" • "The City on the Edge of Forever" • "Operation -- Annihilate!" • "Catspaw" • "Metamorphosis" • "Friday's Child" • "Who Mourns for Adonais?" • "Wolf in the Fold" • "Amok Time" • "The Doomsday Machine" • "The Changeling" • "The Apple" • "Mirror, Mirror" • "The Deadly Years" • "The Trouble with Tribbles" • "Bread and Circuses" • "Journey to Babel" • "A Private Little War" • "The Gamesters of Triskelion" • "Obsession" • "The Immunity Syndrome" • "By Any Other Name" • "Return to Tomorrow" • "The Omega Glory" • "Assignment: Earth" • "And the Children Shall Lead"
Martine, Angela[]
Angela Martine, gespeeld door Barbara Baldavin
- "Balance of Terror" • "Shore Leave" • "Space Seed" • "Turnabout Intruder"
Mudd, Harcourt[]
Harry Mudd, gespeeld door Roger C. Carmel
- "Mudd's Women" • "I, Mudd"
Pike, Christopher[]
Christopher Pike, gespeeld door Jeffrey Hunter en Sean Kenney
Rand, Janice[]
Janice Rand, gespeeld door Grace Lee Whitney
- "The Corbomite Maneuver" • "Mudd's Women" • "The Enemy Within" • "The Man Trap" • "The Naked Time" • "Charlie X" • "Balance of Terror" • "What Are Little Girls Made Of?" • "Miri" • "The Conscience of the King"
Sarek[]
Sarek, gespeeld door Mark Lenard