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 FRAME OF MIND  (#247)
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WITHOUT WARNING, RIKER FALLS VICTIM TO AN UNKNOWN HYSTERIA...

  [ Riker finds himself in a cell; he grabs someone wearing
    a Starfleet medical uniform; Picard is also there ]

  Riker (screaming):  Who are you!?

...AND THE CREW FEARS HE'S SUFFERING FROM A MENTAL BREAKDOWN

   [ Bev examines a nervous Riker in Sickbay ]

  Bev:  The mind can manufacture all kinds of things.

   [ Riker sitting on a Biobed, with Bev, Picard, and Worf
     standing around him;  Riker suddenly hits Worf in the
     head with a metal case and knocks him to the floor ]

BUT ARE THEY ALL IN THE GRIPS OF A POWERFUL ILLUSION?

   [ the images of Worf, Bev, and Picard "shatter",
     to reveal three aliens standing in their place ]

   [ Troi talking to Riker ]

  Troi:  None of its real.  You're still with us on the Enterprise.

   [ Riker runs down an Enterprise corridor ]

   [ An alien jabs a needle instrument into Riker's shoulder ]

...OR IS RIKER SLIPPING INTO A TERRIFYING MADNESS?

   [ In his quarters, Riker sits up suddenly in bed ]

   [ Riker trapped in the "cell", looking out a porthole in the door ]

  Riker (screaming):  Let me out of here!!!!

   [ Riker's image "shatters", to reveal Riker on an alien exam table ]

...ON AN ALL NEW EPISODE OF STAR TREK: THE NEXT GENERATION.


Short version:

  Riker slips into madness, on STAR TREK: THE NEXT GENERATION.