The commander of a quarantine force that incinerates anyone infected by the Loque'eque mutagenic virus, who intends to destroy the transformed Archer, Reed and Hoshi until Phlox produces a cure.
Tret appears in the Enterprise episode Extinction, set in 2153. He leads a containment team from a species that lost millions to a virus created by the extinct Loque'eque, which rewrites its victims into members of that vanished race.
His people patrol the Loque'eque world and burn anyone exposed. When Jonathan Archer, Malcolm Reed and Hoshi Sato are transformed on the surface, Tret's ships confront Enterprise and demand that the infected be handed over.
T'Pol and Trip Tucker stall him while Phlox works. Shown a functioning treatment, Tret relents and takes the cure for his own people's use, though he warns the crew to destroy every remaining sample of the virus.