Cornell was a Jettator who appeared in Highlander: The Animated Series. He was the Jettator of astronomy.
Cornell appeared in the episode Orion's Reign where he had assembled a group of followers who addressed him as Orion (seemingly to exploit a loophole in his oath of non-combat). He planned to battle Kortan during a solar eclipse, when special training he'd undergone would give Cornell the advantage, as he was blind and had learned to fight without the sense of sight.
Ramirez armed himself in preparation to enforce the Jettator's oath on Cornell, eventually forcing him to pass on his knowledge to Quentin before his appointed battle with Kortan. Cornell did indeed duel Kortan during the eclipse to cover his followers' escape, but having surrendered his immortality, was no match and killed.