 With dilitheum reserves running low, Janeway follows Neelix advice and proceeds to the nearest supply! When they arrive in orbit scans reveal a massive supply, however when the away team transport down to the planet there is none there! Completely confused Commander Chackotay orders the away team back to voyager however before they return to Voyager Neelix is attacked by an alien who removes his lung. The EMH then comes up with a solution a holographic lung but this means that Neelix has to stay in a restraint whilst he has the lung and he is unable to mover no more then o.2 nanometres in any direction. Captain Janeway along with Commander Tuvok and a security attachment return to the planet to find the alien who did this and they make a very gruesome discovery a laboratory full of alien organs, they then realise that there was a life in that very room less then 10 minuets ago they then peruse the life form when they catch up with him Tuvok was able to knock the alien s weapon out of his hand however the alien escaped and left on a ship. Voyager gave pursuit however the ships are both equally matched for speed the alien ship then took refuge in an asteroid, Voyager continued to peruse once in side the main cavern of the asteroid the crew see many reflections of voyager and the alien ship however electro-magnetic interference stops them from detecting which one is the correct ship so they send out a low energy phaser beam which will past through any reflections but hit the alien ship without damaging it. once they detected the alien ship the beam the grew aboard, and what they got was two very strange looking aliens who call themselves Viidans who go around harvesting organs from alien and then grafting them on to themselves because they have a genetic disease called  The Phage  this disease affects them on the cellular level. so to survive they need to replace there organs regularly, horrified by what these aliens do and how they are able to throw their morals aside and that she is unable to get Neelix lung back. she then sees that there is nothing she can do but to let them go, but with a harsh warning to never cross her ship again then i what appears to be an act of compassion the aliens offer to help with the transplantation of one of Kes s lungs in to Neelix.