Frank is a man who lived secretly at Castle Von Dinkley
He has white eyes, greenish skin, and an oddly-shaped head like a Frankenstein.
He can act menacing, but he is simple-minded and easily stopped with a reprimand like "Bad Frank!"
Scooby-Doo! (DC Comics)
- He is one of the few culprits who could appear as a monster without a mask.
- Velma found a clue about him in an old laboratory in the castle, but it is never revealed whether he was a monster brought to life by the old Victor Von Dinkley (namesake of the current one) or just a deformed normal man.