Star Trek: Voyager - Season 6 Episode 4 -

The Doctor's experiment with daydreaming gets out of control when his program is compromised by an alien race. The aliens bully passing ships for supplies, but, before doing so, they first consult their command; The Hierarchy. One of the aliens mistakes the daydreams for reality, and gets permission to attack. Upon realizing his mistake, he offers to help Voyager, but only if they act out one of The Doctor's fantasies where he is in command of Voyager.