Descriptions, with my comments and ratings for Star Trek, the original series, season 2.
| # | Gr | Title | Description | Theme or comment |
|---|---|---|---|---|
| 29 | B | Amok Time | Spock must return to Vulcan to wed T'Pring; T'Pau presides | Vulcan society |
| 30 | B | Who Mourns for Adonais? | The crew encounters a super being calling himself Apollo | superior alien |
| 31 | B | The Changeling | A lost earth probe, Nomad, nearly destroys the enterprise | outwitting a machine |
| 32 | A | Mirror, Mirror | Kirk, Uhura, Scott, and McCoy in a parallel universe; Marlena | sci fi |
| 33 | B | The Apple | Val | outwitting a machine |
| 34 | B | The Doomsday Machine | Commodore Decker | Incompetent superior |
| 35 | B/C | Catspaw | Sylvia; Korob | |
| 36 | B | I, Mudd | Mudd reappears on a planet with many androids | outwitting a machine |
| 37 | B | Metamorphosis | Zephrem Cochraine; The Companion | |
| 38 | B | Journey to Babel | The ship escorts ambassadors, including Spock's parents | |
| 39 | B | The Deadly Years | The crew age rapidly | |
| 40 | B | Obsession | Kirk chases a gaseous cloud he first saw 13 years ago | |
| 41 | B | Wolf in the Fold | Mysterious bloody murders | |
| 42 | A | The Trouble with Tribbles | The Federation and the Klingons compete for Sherman's planet | comedy |
| 43 | B | The Gamesters of Triskelion | Crew members are kidnapped to serve as gladiators | superior aliens |
| 44 | A | A Piece of the Action | The crew finds a planet run by gangsters | comedy |
| 45 | B | The Immunity Syndrome | The Enterprise encounters a giant Amoeba in space | |
| 46 | B | A Private Little War | An old friend of Kirk on a planet; another faction is being armed by the Klingons | Vietnam parallel |
| 47 | B | Return to Tomorrow | Kirk, Spock, and Dr Anne Mulhall are taken over by super beings | superior aliens |
| 48 | B | Patterns of Force | An old friend has turned a planet into a Nazi regime | |
| 49 | B | By Any Other Name | Kelvans, beings from another galaxy, hijack the Enterprise | superior aliens |
| 50 | B | The Omega Glory | Yangs and Kohms | alt. Earth |
| 51 | B | The Ultimate Computer | Dr Daystrom installs the M-5 computer to run the Enterprise | outwitting a machine |
| 52 | B | Bread and Circuses | A planet where the Roman Empire lasts into the 20th Century | alt. Earth |
| 53 | B | Friday's Child | The Enterprise and the Klingons compete for a treaty with a planet (Aka-ar) | |
| 54 | B | Assignment: Earth | The Enterprise returns to 1968 Earth to learn how we survived that time | pilot for a proposed new series |
# = Air number