Vin Diesel's Big Marvel Movie Tease — So Is He Playing a Hero or Villain?

Is Vin Diesel joining the Marvel universe? (Photo: Vin Diesel/Facebook) It’s hard to tell which character in the sprawling Marvel Universe might be the perfect fit for Vin Diesel. There are so many fast and furious heroes to go around … not to mention villains, too. The “Riddick” star first teased his possible involvement with an upcoming Marvel…