Zlangco

From Memory Alpha, the free Star Trek reference.

Zlangco was the leader of the Nol-Ennis group, which was destined to forever live and fight their mortal enemies, the Ennis, on a penal colony moon in the Gamma Quadrant. Zlangco, like all of his people and also their enemies, was infected with a breed of nanites designed to keep him permanently alive, fighting forever. It was the Nol-Ennis and Ennis' punishment for breaking peace and warring against each other. The long standing war came to a truce in 2369 when Opaka of Bajor was stranded on that moon. (DS9: "Battle Lines")

Zlangco was played by actor Paul Collins.