A Klingon in 2404 who supplied a future Admiral Janeway with the time travel device she used to bring Voyager home early.
Korath is a Klingon in the alternate future of 2404 shown in Endgame. He meets Admiral Kathryn Janeway at a cave on a planet with a chronal deflector she has arranged to obtain, then demands her shield generator as further payment.
Janeway pretends to agree but takes the device, and when she sets it up for use Korath fires on her. Captain Harry Kim and the USS Rhode Island cover her shuttle as it escapes into the past to change Voyager's history. Vaughn Armstrong played Korath.