Kol

He was a Ferengi officer and served and served aboard Goss's Marouder. In 2366, he through Barzan Wormhole.  Ge went through with a shuttle of the Enterprise-D. The shuttles went to the Delta Quadrant by mistake. Of course the Ferengi refused to follow the shuttlepod back through the wormhole and Kol and Arridor were stuck there.

Arridor

He was a Ferengi doctor. Incapacing a Federation officer with Kol and Daimon Goss, while representing the Ferengi alliance in 2366, going through the Barzan Wormhole. He placed pyracytes on his palm so they would infect Mendoza when they met and shook hands. He and Kol then took a wormhole through the Delta Quadrant.