Stardate 5693.2: The Enterprise finds the missing USS Defiant in an interphase corridor to another universe. Kirk, Spock, McCoy and Chekov beam over, only to find that the crew have killed each other. As the interphase is interfering with the transporter, Kirk has to stay behind and vanishes together with the Defiant. Briefly later Chekov and other crew members exhibit signs of the same insanity that killed the crew of the Defiant. Moreover, a Tholian ship appears. Commander Loskene claims this region of space for the Tholians and gives the Enterprise just enough time until the next interphase to rescue the captain. But the interphase does not occur as calculated, the Tholians attack the Enterprise and Spock returns the fire. The Tholians come back with a second ship and begin to weave an energy field in the form of a "web" around the Enterprise. As there is no chance any longer to rescue Kirk, Spock declares the captain dead. When Kirk's image appears to Uhura, McCoy confines her to sickbay just like the crew members that have gone mad. McCoy successfully develops an antidote to the effects of the space on the crew. In the meantime, however, more of the crew have seen Kirk, who is obviously still alive. Spock devises a plan to break free from the just completed Tholian web by entering the interphase corridor, and the transporter beam on Kirk drags him out of the area as well. The Enterprise successfully re-enters normal space outside the web, and Kirk is beamed aboard alive.

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