Monster Mix-Up

Monster Mix-Up is a story in Scooby-Doo! #125.

Premise
The gang investigates a haunted house and find two monsters that can change places instantaneously, or so it seems.

Characters

 * Scooby-Doo
 * Shaggy Rogers
 * Fred Jones
 * Daphne Blake
 * Velma Dinkley
 * Frankenstein monster
 * Hairy red monster

Villains

 * Two place-switching monsters

Culprits

 * Two villains, both wearing both of the costumes.

Inconsistencies/Continuity Errors and/or Oddities

 * To confuse the villains, Scooby-Doo and Shaggy Rogers disguise themselves as Fred Jones and Daphne Blake, respectively. But "Fred" whispers the complete sentence "I hope this works! Try to be a little quieter on the stairs." Scooby can't talk like that. Perhaps Shaggy was throwing his voice.