Another possible option could be approaching the WWF or like minded wild life associations. That would steer clear of TM/SM infringement, and it could be quite attractive for them in utilizing it to draw deeper awareness of their cause. Although the Grey Wolf population is stable, organizations like the WWF are constantly seeking vehicles to develop their following/support.
It would probably result in a far smaller payday than an entertainment company/fan club of the movies or television series, but it could provide a decent roi while moving a domain from your inventory that treads on the border of a potential SM violation and suit.