| Star Trek: Strange New Worlds | A Quality of Mercy | S1 · E10 | | Co-Starring |
| Star Trek: Strange New Worlds | Hegemony | S2 · E10 | | Guest Starring |
| Star Trek: The Animated Series | Beyond the Farthest Star | S1 · E1 | James DoohanCredited as: Montgomery Scott / Kyle / Ancient insectoid / Magnetic organism / Sciences engineerVoice performance | Starring |
| Star Trek: The Animated Series | Yesteryear | S1 · E2 | James DoohanCredited as: Guardian Voice / Montgomery Scott / Thelin / Erickson / Bates / Aleek-Om / Vulcan healerVoice performance | Starring |
| Star Trek: The Animated Series | One of Our Planets Is Missing | S1 · E3 | James DoohanCredited as: Arex / Montgomery Scott / Bob WesleyVoice performance | Starring |
| Star Trek: The Animated Series | The Lorelei Signal | S1 · E4 | | Starring |
| Star Trek: The Animated Series | More Tribbles, More Troubles | S1 · E5 | James DoohanCredited as: Scott / Koloth / KoraxVoice performance | Starring |
| Star Trek: The Animated Series | The Survivor | S1 · E6 | James DoohanCredited as: Montgomery Scott / Gabler / Romulan CommanderVoice performance | Starring |
| Star Trek: The Animated Series | The Infinite Vulcan | S1 · E7 | James DoohanCredited as: Agmar / Stavos Keniclius 5 / ScottVoice performance | Starring |
| Star Trek: The Animated Series | The Magicks of Megas-Tu | S1 · E8 | | Starring |
| Star Trek: The Animated Series | Once Upon a Planet | S1 · E9 | James DoohanCredited as: White Rabbit / Scott / Master computer / Arex / GablerVoice performance | Starring |
| Star Trek: The Animated Series | Mudd's Passion | S1 · E10 | James DoohanCredited as: Arex / Montgomery Scott / Human miner / Ursinoid male minerVoice performance | Starring |
| Star Trek: The Animated Series | The Terratin Incident | S1 · E11 | James DoohanCredited as: Arex / Scott / Gabler / Mendant of the TerratinsVoice performance | Starring |
| Star Trek: The Animated Series | The Time Trap | S1 · E12 | James DoohanCredited as: Scott / Kaz / Kor / Xerius / GablerVoice performance | Starring |
| Star Trek: The Animated Series | The Ambergris Element | S1 · E13 | James DoohanCredited as: Arex / Cadmar / Cheeron / Clayton / Domar / ScottVoice performance | Starring |
| Star Trek: The Animated Series | The Eye of the Beholder | S1 · E15 | James DoohanCredited as: Tom Markel / Scott / ArexVoice performance | Starring |
| Star Trek: The Animated Series | The Pirates of Orion | S2 · E1 | James DoohanCredited as: O'Shea / Arex / Scott / Orion captain / Orion ensign / Enterprise security guardVoice performance | Starring |
| Star Trek: The Animated Series | Bem | S2 · E2 | James DoohanCredited as: Scott / Ari bn Bem / ArexVoice performance | Starring |
| Star Trek: The Animated Series | The Practical Joker | S2 · E3 | James DoohanCredited as: Scott / Arex / Enterprise engineerVoice performance | Starring |
| Star Trek: The Animated Series | Albatross | S2 · E4 | James DoohanCredited as: Dramen Supreme Prefect / Scott / Kol-TaiVoice performance | Starring |
| Star Trek: The Animated Series | How Sharper Than a Serpent's Tooth | S2 · E5 | James DoohanCredited as: Arex / Walking Bear / Scott / KukulkanVoice performance | Starring |
| Star Trek: The Animated Series | The Counter-Clock Incident | S2 · E6 | James DoohanCredited as: Robert April / Arex / Scott / Karl FourVoice performance | Starring |
| Star Trek: The Next Generation | Relics | S6 · E4 | | Special Guest Star |
| Star Trek: The Original Series | Where No Man Has Gone Before | S1 · E1 | | Featuring |
| Star Trek: The Original Series | The Corbomite Maneuver | S1 · E2 | | Featuring |
| Star Trek: The Original Series | Mudd's Women | S1 · E3 | | Featuring |
| Star Trek: The Original Series | The Enemy Within | S1 · E4 | | Featuring |
| Star Trek: The Original Series | The Man Trap | S1 · E5 | James DoohanCredited as: Montgomery Scott (voice only; recycled audio) | Uncredited co-stars |
| Star Trek: The Original Series | The Naked Time | S1 · E6 | | Featuring |
| Star Trek: The Original Series | Balance of Terror | S1 · E8 | | Featuring |
| Star Trek: The Original Series | The Galileo Seven | S1 · E13 | | Co-Starring |
| Star Trek: The Original Series | The Menagerie, Part I | S1 · E15 | | Starring |
| Star Trek: The Original Series | The Menagerie, Part II | S1 · E16 | | Starring |
| Star Trek: The Original Series | The Squire of Gothos | S1 · E18 | | Featuring |
| Star Trek: The Original Series | Arena | S1 · E19 | | Featuring |
| Star Trek: The Original Series | A Taste of Armageddon | S1 · E23 | | Co-Starring |
| Star Trek: The Original Series | Space Seed | S1 · E24 | | Featuring |
| Star Trek: The Original Series | The Devil in the Dark | S1 · E26 | | Featuring |
| Star Trek: The Original Series | The City on the Edge of Forever | S1 · E28 | | Featuring |
| Star Trek: The Original Series | Operation -- Annihilate! | S1 · E29 | | Featuring |
| Star Trek: The Original Series | Catspaw | S2 · E1 | | Featuring |
| Star Trek: The Original Series | Metamorphosis | S2 · E2 | | Featuring |
| Star Trek: The Original Series | Friday's Child | S2 · E3 | | Featuring |
| Star Trek: The Original Series | Who Mourns for Adonais? | S2 · E4 | | Featuring |
| Star Trek: The Original Series | The Doomsday Machine | S2 · E6 | | Featuring |
| Star Trek: The Original Series | Wolf in the Fold | S2 · E7 | | Featuring |
| Star Trek: The Original Series | The Changeling | S2 · E8 | | Featuring |
| Star Trek: The Original Series | The Apple | S2 · E9 | | Featuring |
| Star Trek: The Original Series | Mirror, Mirror | S2 · E10 | | Featuring |
| Star Trek: The Original Series | The Deadly Years | S2 · E11 | | Featuring |
| Star Trek: The Original Series | I, Mudd | S2 · E12 | | Featuring |
| Star Trek: The Original Series | The Trouble with Tribbles | S2 · E13 | | Featuring |
| Star Trek: The Original Series | Bread and Circuses | S2 · E14 | | Featuring |
| Star Trek: The Original Series | A Private Little War | S2 · E16 | | Guest Stars |
| Star Trek: The Original Series | The Gamesters of Triskelion | S2 · E17 | | Featuring |
| Star Trek: The Original Series | The Immunity Syndrome | S2 · E19 | | Co-Starring |
| Star Trek: The Original Series | A Piece of the Action | S2 · E20 | | Co-Starring |
| Star Trek: The Original Series | By Any Other Name | S2 · E21 | | Featuring |
| Star Trek: The Original Series | Return to Tomorrow | S2 · E22 | | Guest Stars |
| Star Trek: The Original Series | The Ultimate Computer | S2 · E24 | | Guest Stars |
| Star Trek: The Original Series | Assignment: Earth | S2 · E26 | | Co-Starring |
| Star Trek: The Original Series | Spectre of the Gun | S3 · E1 | | Starring |
| Star Trek: The Original Series | Elaan of Troyius | S3 · E2 | | Co-Starring |
| Star Trek: The Original Series | The Paradise Syndrome | S3 · E3 | | Starring |
| Star Trek: The Original Series | The Enterprise Incident | S3 · E4 | | Co-Starring |
| Star Trek: The Original Series | And the Children Shall Lead | S3 · E5 | | Co-Starring |
| Star Trek: The Original Series | Is There in Truth No Beauty? | S3 · E7 | | Co-Starring |
| Star Trek: The Original Series | The Empath | S3 · E8 | | Co-Starring |
| Star Trek: The Original Series | The Tholian Web | S3 · E9 | | Co-Starring |
| Star Trek: The Original Series | For the World is Hollow and I Have Touched the Sky | S3 · E10 | | Guest Stars |
| Star Trek: The Original Series | Day of the Dove | S3 · E11 | | Co-Starring |
| Star Trek: The Original Series | Plato's Stepchildren | S3 · E12 | | Guest Stars |
| Star Trek: The Original Series | Wink of an Eye | S3 · E13 | | Guest Stars |
| Star Trek: The Original Series | That Which Survives | S3 · E14 | | Guest Stars |
| Star Trek: The Original Series | Let That Be Your Last Battlefield | S3 · E15 | | Guest Stars |
| Star Trek: The Original Series | Whom Gods Destroy | S3 · E16 | | Guest Stars |
| Star Trek: The Original Series | The Mark of Gideon | S3 · E17 | | Guest Stars |
| Star Trek: The Original Series | The Lights of Zetar | S3 · E18 | | Guest Stars |
| Star Trek: The Original Series | The Cloud Minders | S3 · E19 | | Co-Starring |
| Star Trek: The Original Series | The Way to Eden | S3 · E20 | | Starring |
| Star Trek: The Original Series | Requiem for Methuselah | S3 · E21 | | Guest Stars |
| Star Trek: The Original Series | The Savage Curtain | S3 · E22 | | Co-Starring |
| Star Trek: The Original Series | All Our Yesterdays | S3 · E23 | | Co-Starring |
| Star Trek: The Original Series | Turnabout Intruder | S3 · E24 | | Guest Stars |
| Star Trek: very Short Treks | Walk, Don't Run | S1 · E5 | | Voice cast |