Tret
Tret was an alien captain whose people had suffered greatly from a viral epidemic caused by a mutagenic virus originating from the Loque'eque homeworld. He enforced his people's quarantine of the Loque'eque homeworld by exterminating any alien who landed on the planet. He had at least one starship and incineration patrols at his disposal.

In 2153, Tret placed  under quarantine when his ship detected that one of Enterprises crewmembers, Malcolm Reed, was infected with the Loque'eque virus. Tret demanded that he be allowed to board Enterprise to eradicate the "infected organism", but  persuaded him to come aboard peacefully to discuss the situation.

In Enterprises sickbay, Tret explained the virus and its origins to the crew. He then returned to his ship to deal with three more Enterprise crewmembers on the surface of the Loque'eque homeworld who had become infected during an away mission. Tret later attacked Enterprise when those infected crewmembers were returned to the ship, determined on preventing them from leaving the system. Tret ultimately relented when Doctor Phlox convinced him that he had successfully devised a cure for the virus. ()

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Individuals
Military personnel