Inside Man

Voyager receives a hologram of Reginald Barclay, bringing news that the ship can be returned home in a matter of hours through a "geodesic fold." However, after seeing him exhibit strange behavior, the crew becomes suspicious of the holographic Barclay's intentions. On Earth, Barclay enlists Counselor Deanna Troi's help to warn the Voyager crew when they discover the Ferengi hijacked Lt. Barclay's hologram and reprogramed it.

Synopsis adapted from TVmaze (CC BY-SA 4.0)