The following is a list of appearances by all the recurring characters of Star Trek: The Original Series
Brent
Brent, played by Frank da Vinci
- "The Corbomite Maneuver" (TOS Season 1)
- "Mudd's Women"
- "Charlie X"
- "Balance of Terror"
- "The Naked Time"
- "Space Seed"
- "The Alternative Factor"
- "Operation -- Annihilate!"
- "The Trouble with Tribbles" (TOS Season 2)
- "Whom Gods Destroy" (TOS Season 3)
- "Elaan of Troyius"
Chapel, Christine
Christine Chapel, played by Majel Barrett
- "The Naked Time" (TOS Season 1)
- "What Are Little Girls Made Of?"
- "Operation -- Annihilate!"
- "Amok Time" (TOS Season 2)
- "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" (TOS Season 3)
- "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"
- Star Trek: The Animated Series (Main Character)
- Star Trek: The Motion Picture (Star Trek Movies)
- Star Trek IV: The Voyage Home
DeSalle
DeSalle, played by Michael Barrier
Farrell, John
John Farrell, played by Jim Goodwin
- "The Enemy Within" (TOS Season 1)
- "Mudd's Women"
- "Miri"
Galloway
Galloway, played by David L. Ross
- "Miri" (TOS Season 1)
- "A Taste of Armageddon"
- "The Galileo Seven"
- "The Return of the Archons"
- "The City on the Edge of Forever"
- "The Trouble with Tribbles" (TOS Season 2)
- "The Omega Glory"
- "Turnabout Intruder" (TOS Season 3)
- "Trials and Tribble-ations" (DS9)
Grayson, Amanda
Amanda Grayson, played by Jane Wyatt
- "Journey to Babel" (TOS Season 2)
- "Yesteryear" (TAS) (voiced by Majel Barrett)
- Star Trek IV: The Voyage Home (Star Trek Movies)
- Star Trek V: The Final Frontier (played by Cynthia Blaise)
Hadley
Hadley, played by William Blackburn
- "The Alternative Factor" (TOS Season 1)
- "A Piece of the Action" (TOS Season 2)
- "The Doomsday Machine"
- "By Any Other Name"
- "Obsession"
- "Whom Gods Destroy"
- "That Which Survives" (TOS Season 3)
- "Requiem for Methuselah"
- "Is There in Truth No Beauty?"
Hansen
Hansen, played by Hagan Beggs
Harper
Harper, played by Sean Morgan
- "The Corbomite Maneuver" (TOS Season 1)
- "This Side of Paradise"
- "The Ultimate Computer" (TOS Season 2)
Kang
Kang, played by Michael Ansara
- "Day of the Dove" (TOS Season 3)
- "Blood Oath" (DS9)
- "Flashback" (VOY)
Kelowitz
Kelowitz, played by Grant Woods
- "The Galileo Seven" (TOS Season 1)
- "Arena"
- "This Side of Paradise"
Koloth
Koloth, played by William Campbell
Komack
Komack, played by Byron Morrow
- "This Side of Paradise" (TOS Season 1)
- "Amok Time" (TOS Season 2)
- "For the World is Hollow and I Have Touched the Sky (TOS Season 3)
Kor
Kor, played by John Colicos
- "Errand of Mercy" (TOS Season 1)
- "Blood Oath" (DS9)
- "The Sword of Kahless" (DS9)
- "Once More Unto the Breach" (DS9)
Kyle
Kyle, played by John Winston
- "Tomorrow is Yesterday" (TOS Season 1)
- "Space Seed"
- "The City on the Edge of Forever"
- "This Side of Paradise"
- "Operation -- Annihilate!"
- "Who Mourns for Adonais?" (TOS Season 2)
- "Wolf in the Fold"
- "The Doomsday Machine"
- "The Apple"
- "Catspaw"
- "The Immunity Syndrome"
- "Mirror, Mirror"
- "The Lights of Zetar" (TOS Season 3)
- "Beyond the Farthest Star" (TAS) (voiced by James Doohan)
- Star Trek II: The Wrath of Khan (Star Trek Movies)
Lemli
Lemli, played by Roger Holloway
- "Return to Tomorrow" (TOS Season 2)
- "The Empath" (TOS Season 3)
- "Whom Gods Destroy"
- "The Cloud Minders"
- "Turnabout Intruder"
Leslie
Leslie, played by Eddie Paskey
- "Where No Man Has Gone Before" (TOS Season 1)
- "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, Part 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" (TOS Season 2)
- "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" (TOS Season 3)
- "Trials and Tribble-ations" (DS9)
Martine, Angela
Angela Martine, played by Barbara Baldavin
Mudd, Harcourt
Harry Mudd, played by Roger C. Carmel
- "Mudd's Women" (TOS Season 1)
- "I, Mudd" (TOS Season 2)
- "Mudd's Passion" (TAS)
Pike, Christopher
Christopher Pike, played by Jeffrey Hunter and Sean Kenney
Rand, Janice
Janice Rand, played by Grace Lee Whitney
- "The Corbomite Maneuver" (TOS Season 1)
- "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"
- Star Trek: The Motion Picture (Star Trek Movies)
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek VI: The Undiscovered Country
- "Flashback" (VOY)
Sarek
Sarek, played by Mark Lenard