Star Trek: Voyager, season 6, episode 4
Tinker, Tenor, Doctor, Spy
Summary
The Doctor adds daydreaming to his program, imagining himself as the Emergency Command Hologram (ECH) aboard Voyager; but aliens, tapping into his perceptions to observe the crew, prepare an attack when they believe that what they are seeing in the daydreams is real.
Summary from Wikipedia, CC BY-SA 4.0.
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