Cos

Cos was an alien who received a gambling device that altered reality. However, by 2370, his luck had changed due to the device. His trade deals, alliances and every endeavour he made, failed.

In that year, he was being held in Deep Space 9's holding cells. Odo placed Martus Mazur was placed in the same cell as Cos. Soon after, Cos won the game, but the shock of doing so killed him. He died a contented man. (DS9: "Rivals")

Cos was played by Albert Henderson.