Star Trek: Voyager, season 7, episode 6
Inside Man
Summary
A hologram of Reginald Barclay is sent to Voyager, supposedly to implement a dangerous plan to bring them home; but the hologram has been tampered with by some Ferengi, who are trying to steal valuable Borg nanoprobes from Seven of Nine.
Summary from Wikipedia, CC BY-SA 4.0.
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