Major Ghost Debut(s): Wulf - A werewolf-like ghost that became Danny's friend. He speaks very little English. Wulf sacrificed himself to save Danny from being sent to the Ghost Zone. He has the power to make a portal to the real world by using his claws. Bullet - He seems to be Walker's head henchman. Not much is known about him, except that he is just as strict as Walker and also after Danny.