APPEARANCE Watch Captain Marcus Trenker is one of the Captains of the Dock Watch. A hard-headed calculating man with no illussions about the futility of his job.   PERSONALITY Tough, blunt, calculating and hard-nosed.   BACKGROUND A former soldier who has seen too much and has found refuge in the Dock Watch. The watch gives him enough challenge to keep him interested but without the mind-numbing horror of open battle.