The romanized Klingon spelling of Kruge is Qugh, which is also the word for '''disaster'''. Fittingly, he was commander of a Klingon Bird of Prey on an ill-fated mission to collect all available information on the Federation's secret weapon known as The Genesis Device. Serving this mission, he lost his mate, his pet, all but one of his crew (Maltz, who was captured) and his ship (also captured). He was defeated while bravely fist-fighting the infamous Kirk on the Genesis Planet.
Truely, his sacrifice has earned him hero status. Qugh, reH batlh Daqawlu'taH!