Tret's species
From Memory Alpha, the free Star Trek reference.
Tret's species was a humanoid race whose people had suffered from an epidemic caused by a mutagenic virus originating from the Loque'eque homeworld.
Tens of millions of people on this species homeworld were infected with the mutagen. To prevent the virus from transforming the entire population this species resorted to genocide, to prevent the destruction of their own race.
This species began studying the mutagen in the 2090s, but were unsuccessful in their attempts. They felt that the only course of action against it is to neutralize the outbreak. This was accomplished by putting a quarantine on the Loque'eque homeworld, and incinerating any alien who landed on the planet and became Loque'eque. (ENT: "Extinction")
- It is unclear if it was due to their study of the mutagen that this species became infected with the virus, or if it was the infection from the virus that led to its study.
