Stardate 46778.1: With a few days rest before leading an undercover mission on Tilonus IV, Riker takes on the demanding role of a patient in a mental hospital in Beverly's stage play "Frame of Mind", together with Data as his therapist. While he is rehearsing for the play, Riker is under psychic strain, he thinks that he is making up things but carries on. However, just after the play is over and everyone applauds, Riker finds himself in what looks like a real mental hospital on the planet Tilonus, talking to Dr. Syrus instead of Data. Riker begins to switch between the Enterprise and the mental institution, and he has no idea which of the two is real. He finally submits to the idea that he is actually mentally ill and agrees to a treatment by Dr. Syrus. When he is rescued from the hospital by Data and Worf, Riker still can't believe that he is on the ship now. He takes a phaser and destroys this illusion. Actually, he has been captured by the Tilonians who have drugged him to extract strategic information from his brain, and only after he drops both illusions he wakes up and manages to arrange for an emergency beam-out.

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