The Mission follows a group of mercenaries as they take a dying scientist to the planet Valdorion in what they believe is a search for a cure. Under advisement from Senator Tyrell and against his better judgment, the commander of the Undead agrees to take the youngest member of his mercenaries on the mission to the distant world. Mack gives fourteen year old Darkblood the task of protecting and transporting Victor Magnus, a scientist who is dying as a result of an accident in his lab. It is only when they reach Valdorion, the planet's only city, that Darkblood discovers the dark truth behind their mission.