Vidiian are a race of human like aliens who have been disfigured by a disease called the Phage. They have advanced more than any other alien race in terms of medicine but they have not yet been able to discover a cure for the Phage. To stay alive, the Vidiians take body parts from other alien races in order to keep themselves healthy. The Vidiians were able to separate the Klingon and Human DNA from Belanna Torres thus creating two new people. However, the Doctor had to re-add the Klingon DNA to Belanna Torres or she would die. A uninfected Vidiian looks like a human from Earth but with a large forehead.
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