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09.08.73 |
 Beyond the Farthest Star |
 22004 |
 1 |
 5521.3 |

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The Enterprise is dragged off course by Questar M-17, an imploded negative star mass, and meets a strange shapeless being.
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09.15.73 |
 Yesteryear |
 22003 |
 1 |
 5373.4 |

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By using the Guardian of Forever, Kirk, Spock, and the historian Erikson explore the planet Orion's past. When they return, there is no record of Spock.
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09.22.73 |
 One of Our Planets is Missing |
 22007 |
 1 |
 5371.3 |

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The Enterprise crew learns that a massive, planet-destroying extragalactic entity has entered Federation space and threatens every planet in the galaxy.
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09.29.73 |
 The Lorelei Signal |
 22006 |
 1 |
 5483.7 |

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The Enterprise enters an uncharted sector of space where Federation and Klingon vessels have been reported missing every 27 years.
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10.06.73 |
 More Tribbles, More Troubles |
 22001 |
 1 |
 5329.4 |

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The tribbles return for more trouble as the Enterprise encounters Cyrano Jones, the Klingons and a new breed of the popular pest.
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10.13.73 |
 The Survivor |
 22005 |
 1 |
 5143.3 |

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A long-lost philanthropist, Carter Winston, is discovered on board a damaged one-man vessel and is reunited with his fiancée on board the Enterprise.
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10.20.73 |
 The Infinite Vulcan |
 22002 |
 2 |
 5554.4 |

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While visiting a new planet, Sulu is poisoned and Spock becomes cloned by the Phylosians, a plant-like species.
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10.27.73 |
 The Magicks of Megas-Tu |
 22009 |
 2 |
 1254.4 |

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While investigating the theory of creation, the Enterprise is caught inside an energy/matter tornado and pulled to the center of the galaxy.
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11.03.73 |
 Once Upon a Planet |
 22017 |
 2 |
 5591.2 |

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The Enterprise returns to the amusement planet where the crew had once taken shore leave, but this time things go wrong.
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11.10.73 |
 Mudd's Passion |
 22008 |
 2 |
 4978.5 |

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The Enterprise is ordered to find Harry Mudd, a Federation outlaw, who is accused of selling a fake love potion to miners.
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11.17.73 |
 The Terratin Incident |
 22015 |
 2 |
 5577.3 |

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A strange flash of light paralyzes the entire Enterprise crew and all organic matter begins to shrink.
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11.24.73 |
 The Time Trap |
 22010 |
 2 |
 5267.2 |

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While exploring the Delta Triangle, where many starships have disappeared, the Enterprise is attacked by several Klingon vessels.
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12.01.73 |
 The Ambergris Element |
 22013 |
 3 |
 5499.9 |

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The Enterprise arrives to study the planet Argo, a water-based planet where earthquakes caused the land masses to sink.
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12.15.73 |
 The Slaver Weapon |
 22011 |
 3 |
 4187.3 |

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When a rare artifact of the Slaver culture, a time-stopping stasis box, is being delivered to Starbase 25, it registers that another one is nearby.
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01.05.74 |
 The Eye of the Beholder |
 22016 |
 3 |
 5501.2 |

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The disappearance of a scientific team lures the Enterprise to investigate near Lactra VII.
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01.12.74 |
 The Jihad |
 22014 |
 3 |
 5683.1 |

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On Vedala, Kirk and Spock are summoned to learn about a stolen religious artifact that could ignite a galaxy-wide holy war, a jihad.
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09.07.74 |
 The Pirates of Orion |
 22020 |
 3 |
 6334.1 |

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A dreaded disease, choriocytosis, strikes the Enterprise. All except Spock are cured, as the illness is fatal only to Vulcans.
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09.14.74 |
 Bem |
 22018 |
 4 |
 7403.6 |

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Starfleet, eager to open diplomatic relations with the medically advanced Pandronians, assigns Enterprise to host one of their representatives.
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09.21.74 |
 The Practical Joker |
 22021 |
 4 |
 3183.3 |

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While studying an asteroid, the Enterprise is attacked by three Romulan vessels which claim that the Federation ship has trespassed into Romulan space.
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09.28.74 |
 Albatross |
 22019 |
 4 |
 5275.6 |

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The Enterprise arrives at Dramia I to deliver medical supplies when Dr. McCoy is arrested for mass slaughter and imprisoned.
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10.05.74 |
 How Sharper Than a Serpent's Tooth |
 22022 |
 4 |
 6063.4 |

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While tracking a probe, the Enterprise encounters an alien vessel that is surrounded by an energy field which proceeds to encompass the Federation ship.
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10.12.74 |
 The Counter-Clock Incident |
 22023 |
 4 |
 6770.3 |

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A hyper-accelerated alien ship drags the Enterprise into a nova and both arrive in an antimatter universe where time flows backwards.
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