Wulf appeared in a second episode where was released into the woods by Danny after a second battle with Walker.
Back when Nickelodeon didn't lack variety.
"And then Danny was sent to a Christmas Party in the Ghost Zone being held by his rouges gallery, who all invite him in kind, and reveal that all ghosts have a truce to not cause any mischief on Christmas.""You've been drinking again, haven't you?""Shut up! You're not the boss of me!"