| No. | Original | Japanese | Romaji | Meaning |
|---|
| 1 | Where No Man Has Gone Before | 光るめだま | Hikaru Medama | Bright Eye |
| 2 | The Corbomite Maneuver | 謎の球体 | Nazo no Kyutai | Mysterious Sphere |
| 3 | The Man Trap | 惑星M113の吸血獣 | Wakusei M113 no Kyuketsu-ju | Vampire Monster on Planet M113 |
| 4 | What Are Little Girls Made of? | コンピューター人間 | Computer Ningen | Computer Human |
| 5 | The Naked Time | 魔の宇宙病 | Ma no Uchu-byou | Dangerous Space Disease |
| 6 | Balance of Terror | 宇宙基地SOS | Uchu-kichi SOS | Space Station SOS |
| 7 | The Enemy Within | 二人のカーク | Futari no Kirk | Two Kirk |
| 8 | Charlie X | セイサス星から来た少年 | Thasus-sei kara Kita Shounen | Boy Come from Planet Thasus |
| 9 | Miri | 400才の少女 | 400sai no Shojo | 400-years-old Girl |
| 10 | The Galileo Seven | ゴリラの惑星 | Gorilla no Wakusei | Gorilla's Planet |
| 11 | The Conscience of the King | 殺人鬼コドス | Satsujin-ki Kodos | Killer Kodos |
| 12 | Arena | 怪獣ゴーンとの決闘 | Kaiju Gorn tono Kettou | Duel Against Monster Gorn |
| 13 | Mudd's Women | 恐怖のビーナス | Kyoufu no Venus | Scare Venus |
| 14 | Tomorrow Is Yesterday | 宇宙暦元年7・21 | Uchu-reki Gan'nen 7.21 | Stardate Start Year 7.21 |
| 15 | Space Seed | 宇宙の帝王 | Uchu no Teiou | Emperor of Space |
| 16 | Court Martial | 宇宙軍法会議 | Uchu-gunpou-kaigi | Space Court-Martial |
| 17 | Dagger of the Mind | 悪魔島から来た狂人 | Akuma-tou kara Kita Kyojin | Madman Come from Demon Island |
| 18 | The Alternative Factor | 二つの宇宙 | Futatsu no Uchu | Two Universes |
| 19 | A Taste of Armageddon | コンピューター戦争 | Computer Sensou | Computer War |
| 20 | The Devil in the Dark | 地底怪獣ホルタ | Chitei-kaiju Horta | Underground Monster Horta |
| 21 | This Side of Paradise | 死の楽園 | Shi no Rakuen | Deadly Paradise |
| 22 | The Squire of Gothos | ゴトス星の怪人 | Gothos-sei no Kaijin | Suspected on Planet Gothos |
| 23 | The City on the Edge of Forever | 危険な過去への旅 | Kiken'na Kako heno Tabi | Journey to Dangerous Past |
| 24 | The Return of the Archons | ベータ・スリーの独裁者 | Beta Three no Dokusai-sha | Dictator on Beta Three |
| 25,26 | The Menagerie | タロス星の幻怪人 | Talos-sei no Maboroshi-kaijin | Phantom Suspected on Planet Talos |
| 27 | Shore Leave | おかしなおかしな遊園惑星 | Okashina Okashina Yuen-wakusei | Funny Funny Amusement Planet |
| 28 | Operation - Annihilate! | デネバ星の怪奇生物 | Deneva-sei no Kaiki-seibutsu | Antick Creature on Planet Deneva |
| 29 | Errand of Mercy | クリンゴン帝国の侵略 | Kligon Teikoku no Shinryaku | Invasion of Klingon Empire |
| No. | Original | Japanese | Romaji | Meaning |
|---|
| 30 | Catspaw | 惑星パイラスセブンの怪 | Wakusei Pyrus Seven no Kai | Mystery on Planet Pyrus Seven |
| 31 | Metamorphosis | 華麗なる変身 | Karei-naru Henshin | Gorgeous Transfiguration |
| 32 | Friday's Child | 宿敵クリンゴンの出現 | Shukuteki Klingon no Shutsugen | Appearance of Enemy Klingon |
| 33 | Who Mourns for Adonais? | 神との対決 | Kami tono Taiketsu | Confrontation Against God |
| 34 | Amok Time | バルカン星人の秘密 | Vulcan-seijin no Himitsu | Vulcans' Secret |
| 35 | The Doomsday Machine | 宇宙の巨大怪獣 | Uchu no Kyodai-kaiju | Huge Monster in Space |
| 36 | Wolf in the Fold | 惑星アルギリスの殺人鬼 | Wakusei Argelius no Satsujin-ki | Killer on Planet Argelius |
| 37 | The Changeling | 超小型宇宙船ノーマッドの謎 | Chou-kogata-uchusen Nomad no Nazo | Mystery of Micromini Spaceship Nomad |
| 38 | The Apple | 死のパラダイス | Shi no Paradise | Deadly Paradise |
| 39 | Journey to Babel | 惑星オリオンの侵略 | Wakusei Orion no Shinryaku | Invasion of Planet Orion |
| 40 | Mirror, Mirror | イオン嵐の恐怖 | Ion-arashi no Kyofu | Terror of Ion Storm |
| 41 | I, Mudd | 不思議の宇宙のアリス | Fushigi no Uchu Alice | Alice in Wonder Space |
| 42 | The Deadly Years | 死の宇宙病 | Shi no Uchu-byou | Deadly Space Disease |
| 43 | The Trouble with Tribbles | 新種クアドトリティケール | Shinshu Quadrotriticale | New Type Quadrotriticale |
| 44 | Bread and Circuses | もう一つの地球 | Mou-hitotsu no Chikyu | Another Earth |
| 45 | The Gamesters of Triskelion | 宇宙指令! 首輪じめ | Uchu-shirei! Kubiwa-jime | Space Order! Torques Clinch |
| 46 | Obsession | 復讐! ガス怪獣 | Fukushu! Gas-kaiju | Revenge! Gas Monster |
| 47 | The Immunity Syndrome | 単細胞物体との衝突 | Tansaibou-buttai tono Shoutotsu | Crush with Unicellulate |
| 48 | The Omega Glory | 細菌戦争の果て | Saikin-sensou no Hate | Bitter End of Biowar |
| 49 | A Piece of the Action | 宇宙犯罪シンジケート | Uchu-hanzai Syndicate | Space Crime Syndicate |
| 50 | By Any Other Name | 宇宙300年の旅 | Uchu 300nen no Tabi | Space Journey for 300 Years |
| 51 | Patterns of Force | エコス・ナチスの恐怖 | Ekos Nazi no Kyoufu | Terror of Ekos Nazi |
| 52 | The Ultimate Computer | 恐怖のコンピューターM-5 | Kyoufu no Computer M-5 | Terrible Computer M-5 |
| 53 | Return to Tomorrow | 地底160キロのエネルギー | Chitei 160kiro no Energy | Energy from Underground 160km |
| 54 | Assignment: Earth | 宇宙からの使者 Mr.セブン | Uchu karano Shisha Mr. Seven | Messenger from Space Mr. Seven |
| No. | Original | Japanese | Romaji | Meaning |
|---|
| 55 | Spectre of the Gun | 危機一髪! OK牧場の決闘 | Kiki-ippatsu! OK Bokujou no Kettou | Close Call! Duel at OK Corral |
| 56 | Elaan of Troyius | トロイアスの王女エラン | Troyius no Oujo Elaan | Princess Elaan of Troyius |
| 57 | The Paradise Syndrome | 小惑星衝突コース接近中 | Shouwakusei Shoutotsu Course Sekkin-chu | Asteroid Crush Course Intercepting |
| 58 | The Enterprise Incident | 透明宇宙船 | Toumei Uchusen | Transparent Starship |
| 59 | And the Children Shall Lead | 悪魔の弟子達 | Akuma no Deshi-tachi | Demon's Disciples |
| 60 | Spock's Brain | 盗まれたスポックの頭脳 | Nusumareta Spock no Zunou | Stolen Spock's Brain |
| 61 | Is There in Truth No Beauty? | 美と真実 | Bi to Shinjitsu | Beauty and Truth |
| 62 | The Empath | 恒星ミナラの生体実験 | Kousei Minara no Seitai-jikken | Living-body Test of Star Minara |
| 63 | The Tholian Web | 異次元空間に入ったカーク船長の危機 | Ijigen-kukan ni Haitta Kirk-senchou no Kiki | Captain Kirk's Dangerous into Another Dimension |
| 64 | For the World Is Hollow and I Have Touched the Sky | 宇宙に漂う惑星型宇宙船 | Uchu ni Tadayou Wakusei-gata Uchusen | Planet-type Spaceship Hoving in Space |
| 65 | Plato's Stepchildren | キロナイドの魔力 | Kironide no Maryoku | Magic of Kironide |
| 66 | Day of the Dove | 宇宙の怪! 怒りを喰う!? | Uchu no Kai! Ikari wo Ku!? | Mystery in Space! Eating Angry!? |
| 67 | That Which Survives | 無人惑星の謎 | Mujin-wakusei no Nazo | Mystery of Unpeopled Planet |
| 68 | Let That Be Your Last Battlefield | 惑星セロンの対立 | Wakusei Cheron no Tairitsu | Hostility on Planet Cheron |
| 69 | Whom Gods Destroy | 宇宙の精神病院 | Uchu no Seishin-byouin | Insane Asylum in Space |
| 70 | The Mark of Gideon | 長寿惑星ギデオンの苦悩 | Chouju-wakusei Gideon no Kunou | Suffering on Long-life Planet Gideon |
| 71 | The Lights of Zetar | 消滅惑星ゼータの攻撃 | Shoumetsu-wakusei Zetar no Kougeki | Attack of Vanishing Planet Zetar |
| 72 | The Cloudminders | 惑星アーダナのジーナイト作戦 | Wakusei Ardana no Zenite Sakusen | Zenite Operation on Planet Ardana |
| 73 | The Way to Eden | 自由の惑星エデンを求めて | Jiyu no Wakusei Eden wo Motomete | Seek Eden the Freedom Planet |
| 74 | Requiem for Methuselah | 6200歳の恋 | 6200sai no Koi | 6,200-years-old's Love |
| 75 | The Savage Curtain | 未確認惑星の岩石人間 | Mikakunin-wakusei no Ganseki-ningen | Rock People on Unidentified Planet |
| 76 | All Our Yesterdays | タイムマシンの危機 | Time Machine no Kiki | Dangerous of Time Machine |
| 77 | Wink of an Eye | 惑星スカロスの高速人間 | Wakusei Scalos no Kousoku-ningen | High-speed People on Planet Scalos |
| 78 | Turnabout Intruder | 変身! カーク船長の危機 | Henshin! Kirk-senchou no Kiki | Transfiguration! Dangerous of Captain Kirk |
| 79* | A Private Little War | カヌーソ・ノナの魔力 | Kahn-ut-tu Nona no Maryoku | Kahn-ut-tu Nona's Magic |
| * It's not a mistake. On airing in Japan, the last episode is "A Private Little War."
|
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