The Vampire Pumpkinhead was the disguise of an unnamed man.
Physical appearance[]
It's a tall, light gray vampire with an orange pumpkin for a head. It wore a gray suit, a red and black cape, a bowtie and dress shoes.
Personality[]
He is frightening and very desperate on capturing anyone who enters the haunted house, but can get very annoyed when his victims get rescued and starts speeding up on capturing the savior.
History[]
Unnamed man unmasked.
He ran around the haunted house and captured each member of the gang one-on-one, by shoving a spare pumpkinhead over their own which freezes them in place, he then went and locked them up in different rooms.
This was all noticed by Scooby, who was in the Mystery Machine. He decided to enter the house and rescue the rest of the gang from the pumpkinheaded vampire, who made several attempts on trying to either get him captured or scared away. But thanks to some help from his nephew Scrappy, Scooby was able to rescue everybody and capture the Vampire Pumpkinhead, who turned out to be an unnamed man.
The mystery itself soon ended up on newspapers some time later.