Janeway grows concerned when B'Elanna, Paris, and Lieutenant Peter Durst fail to report in for beam-up after an away mission. In reality, the phage-plagued Vidiians are kidnapping visitors and masking the landscape to cover their operation on the planet. The scientist Sulan is in search of a cure for the deadly disease of his people. During an experiment, B'Elanna is literally split into two separate beings -- one fully Klingon, the other fully human -- by Sulan, who believes Klingons may be immune to the phage. Since the Vidiians are too weak to do their own labor, the unused hostages including Paris, Durst and another Talaxian are put to work digging tunnels.
