Stardate not given: An alien parasite attaches itself to B'Elanna. The Doctor's knowledge about exobiology being limited, he creates a consulting program in the form of the Cardassian physician Crell Moset, but the man turns out to be a war criminal. Janeway decides that, although Moset's knowledge is from inhuman experiments on Bajoran prisoners, it should be applied to save B'Elanna and the program be deleted thereafter.

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