Star Trek: Voyager, season 7, episode 10
Flesh and Blood, Part II
Summary
Voyager encounters aliens from the planet Sikaris, a highly advanced race. They have a device that could potentially send Voyager home, but the Sikarans have a law – similar to the Federation’s Prime Directive - that does not allow them to share such advanced technology.
Summary from Wikipedia, CC BY-SA 4.0.
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