Species 8472, formally known as Undine, is a fictional extraterrestrial species in the science fiction television series Star Trek: Voyager. Species 8472 is a designation given to them by the Borg. The multiplayer game Star Trek Online gives their proper name as Undine.
When the USS Voyager made contact with them, Species 8472 were engaged in a war with one of Star Trek's perennial antagonists, the Borg.[1] They are noted for being a tripedal and telepathic species and for their use of biotechnology.[1] They originated from what is called fluidic space and fought a successful war against the Borg for a time.[1] They made peace with the Federation by negotiations with Captain Kathryn Janeway of the Starfleet vessel USS Voyager in the later 24th century.[1]