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Babylon 5 had an episode on this. A sleeper ship was launched and a few years later we got jump gate tech from an alien race.
It was also the plot of a sci fi story Far Centaurus by AE Van Vogt.
The Orville too. And apparently this show called “Ark” too (going by other comments). And in books and video games too. Seems to be a common sci-fi trope.
That’s how they found Khan in Star Trek.
