Stardate 48532.4: An away team beams down to a planetoid where Neelix expects to find rich dilithium deposits. But he runs into an alien, who uses an advanced medical instrument to remove his lung. The Doctor can only keep him alive by replicating a pair of holographic lungs. Voyager follows the ion trail of the alien ship into an asteroid. Inside the asteroid there is a "hall of mirrors" that doesn't allow to scan for the alien ship. On Chakotay's suggestion Tuvok sweeps the interior with a low-intensity phaser beam, which eventually hits the alien ship, thereby revealing its true location. Janeway has the two crew members beamed aboard. They are members of the Vidiians, a race that suffers from the "phage", a terrible decay of their organisms that forces them to steal alien organs for their survival. As Neelix's lungs have already been altered for one of the Vidiians named Motura and Janeway is opposed to killing him, she is willing to let them go. Motura, however, agrees to help Neelix before he leaves. He modifies one of Kes's lungs for a transplantation into Neelix's body.

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