Various people help or hinder Jack in his quest. Of particular importance are the werewolves, known simply as Wolfs, who inhabit the Territories. These are not the savage killers of tradition: they serve as royal herdsmen or bodyguards, and can sometimes under stress voluntarily change to wolf form, in addition to facing an involuntary transformation that lasts about three days at the time of the full moon. A sixteen-year-old Wolf, simply named Wolf, is pulled into America by Jack Sawyer and adopts Jack as his pack, serving as his companion. Wolf is extremely likeable, kind, loyal and friendly, much like a dog, though his wolf nature shows through on occasion. On the other hand, some Wolfs have joined the malevolent faction which is trying to stop Jack.