Stardate 42193.6: In an unexplored region of space the Enterprise approaches a "hole in space" and becomes trapped within the phenomenon. A Romulan Warbird attacks, but turns out to be an illusion. Then the Enterprise's sister ship USS Yamato appears. Riker and Worf beam over, to find that it too is an illusion. The whole scenario is part of a plan of an alien named Nagilum, who wants to study human reactions to death. When Nagilum kills a crew member and announces that half of the crew will die in further experiments, Picard orders the ship's self-destruct. He calls off the procedure in the last seconds of the countdown. Nagilum appears again, stating that it has learned enough by just watching the crew's preparations to die, and releases the ship.

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