Date not given: The Xindi are tracked to an apparently uninhabited planet, where a landing party composed of Archer, Reed, T'Pol and Hoshi find a Xindi shuttlepod and a corpse that is initially found to be not Xindi. Soon the three human members of the team mutate to a different species and begin to seek a place called "Urquat", while T'Pol is only slightly affected. They are victims of a mutagenic virus, long ago created by the now extinct Loque'eque in an effort to preserve their species. Urquat is now in ruins. Two starships appear in orbit and an alien announces that they would kill any mutated individual. After fighting against the extermination team, the mutated crew members can be restored to their human form using an anti-virus produced in T'Pol's body. Phlox gives the anti-virus to the aliens. Archer, however, insists on keeping a sample of the virus as a last reminder of the Loque'eque.

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