Sigon

Sigon was a Klingon Defense Force officer who commanded the after the  was severely damaged by a tribble infestation. He made friends with Captain McCary and would typically invite him to celebrations. 

History
Every year, Sigon would partake in the ritual conquering of the planet Raatooras, which included the re-enslaving, hunt for an oblivious Takarian Sage and large feast. In 2410, Captain McCary stumbled upon this was invited to the festivities. Despite discovering everything the Klingons were doing, Sigon persuaded him to eat. ("")

Later, the became infested by alternate universe, spaceborne tribble. Sigon and his crew came victim to them, where they would begin a transformation process in which they would all begin to turn into giant tribble. With the help of McCary and his crew, Sigon was able to see the Mother Tribble defeated. Soon after, both Doctors from both ships worked together in finding what they thought was a solution to the transformation problem. For a short time, the crew of the Rotog and USS Tsunami were safe from turning into them, but the Rotog took on too much damage, so Sigon and the crew were transferred to the. At some point, after, the transformation would return, and the crew completely turned into giant tribble. Since McCary had transformed himself, sooner, by his time on Nibiru, he was able to advise Sigon that going through with the tribble self-pregnancy would run the spaceborne tribble's vemon's course and they would turn back to normal. Sigon and his crew proceeded to have their pregnancies, but Sigon found he had a miscarriage. Shortly after everyone turned back to normal, the tribble spawns were ejected into space, ("", "", "")

Back to normal, the Sigon and the crew planned a blood wine celebration aboard the Baetal, and Sigon invited McCary and the crew of the Tsunami. At this point, Sigon began seeing visions of tribble, causing him to go hunting for them throughout his ship. At what he thought was a group of tribble, instead of a group of targ, he attacked and murdered as viciously as possible, depleting the crew's targ supply. After he admitted that there was still tribble venom within him, he, unintentionally launched a ship-to-ship attack at the Tsunami, believing them to be the Mother Tribble. The Tsunami was near-destroyed, forcing the Starfleet crew to evacuate their ship. ("")