Stardate 50912.4: An alien materializes in a corridor on Voyager. The man is named Dammar, he says he comes from a Nyrian colony and feels comfortable only if the temperature is as high as 45°C. When the Doctor wants to examine him, it turns out that Kes is missing. Gradually more Nyrians appear on the ship, replacing Voyager crew members. After Janeway has vanished too, Chakotay recognizes that the Nyrians are taking over the ship. He disables the warp drive and saves the Doctor's program until he is transferred too. The Voyager crew are prisoners in a habitat that was specially designed for them. A portal opens, and an alien named Jarlath steps out, who is a prisoner in the neighboring habitat. He is not interested in escape, but based on his hints B'Elanna modifies the Doctor's sensors to scan for other portals. Janeway, Tuvok, Torres and Paris step through the portal and discover a corridor system. There are as many as 94 different environments on a huge ship. Janeway and Tuvok take control of the Nyrian translocator. She transports the Nyrian leader Dammar from Voyager to an arctic habitat and thereby forces him to release Voyager and all alien prisoners.

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