Vorgon

Vorgons are a sapient humanoid species which, as of the 27th century, have mastered time travel technology.

Virtually nothing else is known about this species except that two members of it once returned in time to the 24th century to witness Captain Jean-Luc Picard's archaeological discovery of the Tox Uthat, a powerful weapon developed by another time traveler (presumably of a different species) which had been hidden on Risa sometime during the 22nd century. The Vorgons attempt to steal the Tox Uthat at first, but when Picard intentionally destroys the device, they claim that he now fulfilled his role in history and disappear back to their own time.