This page contains information regarding Star Trek: Lower Decks, and thus may contain spoilers.
Rebner was a Pakled who commanded the clumpship Pakled in the late 24th century. He had several clandestine dealings with Captain Dorg of the Klingon Bird-of-Prey IKS Che'ta', who supplied him with weapons in the hopes of destabilizing the Federation.
In a meeting with Dorg in 2381, Rebner informed him that they needed another Varuvian bomb as the one Dorg previously gave them had "stopped working" after they tested it on a large asteroid in System 7743.8. Dorg furiously told him that it was a bomb and thus could only be used once, and had another beamed to the Pakled. Shortly after, the Pakled and Che'ta' were discovered by the Federation starship USS Cerritos and Vulcan cruiser Sh'vhal. In the ensuing battle, the Che'ta' disengaged after Ma'ah replaced Dorg as captain, and Rebner was forced to retreat as the Pakled became overwhelmed. (LD: "wej Duj")