Visions & illusions
(covers information from a vision or illusion)

Doctor Syrus was supposedly a psychiatrist on the planet Tilonus IV.

He worked in Ward 47 of the Tilonus Institute for Mental Disorders. In truth, Syrus was a character in a delusion created by a neurosomatic technique used by Suna, who was trying to extract tactical information from Commander William T. Riker. (TNG: "Frame of Mind")

Syrus was played by David Selburg.
He was called Osyrus in the first draft script.
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