My latest in the Were-Aykroyd morphs, specifically this one is of Derek into a 'hitchhiking monster/ghoul' like the one from the opening of the Twilight Zone movie (see below) and basically the premise is that the 'Passenger/Ambulance Driver' is picked up by Derek although Derek attempts to fight off the Passenger in his werewolf form, the Passenger possesess him and he becomes a hitchhiking ghoul/monster just like him in that way.

Wanna See Something Scary clip here:
https://www.youtube.com/watch?v=ETC6NSxpFFE