Children of Time (Star Trek: Deep Space Nine)
episode of Star Trek: Deep Space Nine (S5 E22)

"Children of Time" is the 120th episode of the television series Star Trek: Deep Space Nine, the 22nd episode of the fifth season. In this episode, the crew of Deep Space Nine encounter their own descendants due to a time loop, and are faced with a difficult ethical decision.
Plot
The starship Defiant investigates a planet surrounded by an unusual energy barrier. They find the planet is inhabited by 8,000 descendants of the Defiant's crew. The crew are told that tomorrow, when the Defiant tries to leave the planet, it will be thrown back in time. After the Defiant crashed on the planet 200 years ago, with no hope of contacting the Federation or repairing the ship, the stranded 48-person crew (including Dax, Sisko, O'Brien, Worf, and Dr. Bashir) remained and established a society. Unfortunately, the stranded Major Kira died a few weeks after the crash due to neural damage she incurred when the ship was passing through the energy barrier; Bashir did not have the medical equipment on the Defiant required to treat her.
In addition to their descendants, two members of the original crew of the Defiant still exist on the colony. The Changeling physiology of Odo has given him greater longevity than the rest (along with a more human appearance), while the Trill symbiont Dax continues to live on in a new host, Yedrin.
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This entry incorporates text from “Children of Time (Star Trek: Deep Space Nine)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.