Date not given: Enterprise is swallowed by a much bigger spacecraft. After exploring its interior, Commander Tucker turns out to be possessed by a non-corporeal alien lifeform. Archer's demand to leave Tucker and to release the ship is apparently fulfilled by the alien. But as the crew is working to get the ship operational again, more aliens come aboard, taking over 24 of the crew, while the rest manages to hide in the impenetrable nacelle catwalk. Dr. Phlox, incompatible with the aliens, floods the ship with carbon dioxide, making the possessed crew almost suffocate, whereupon the aliens leave.

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