Scooby-Doo! Halloween 2-Film Collection includes: Trick or Treat Scooby-Doo! - Menacing ghosts of the Scooby crew and favorite classic foes are threatening Halloween. With trick-or-treating on the line, it’s up to Mystery Inc. to save the day! Happy Halloween, Scooby-Doo! - Scooby-Doo and the gang team up with their pals, Bill Nye The Science Guy and Elvira Mistress of the Dark, to solve this mystery of gigantic proportions and save Crystal Cove!