Mr. Carswell was a bank president.
Middle-aged man, white hair, and wears glasses.
He appears friendly and well-mannered, but in reality he is an embezzler who violently beats up one of his own bank guards who had evidence against him.
Scooby-Doo, Where Are You!
He dressed up as the Creeper so he could take the money from his bank and no one would know it was him. Mystery Inc. met him when they found one of his bank guards lying unconscious in the middle of the road and brought him to Carswell's house. Carswell then proceeded to tie up the bank guard and lock him in the basement and then went after Scooby-Doo and the gang when he realized they held evidence that proved he was a thief.
"Blasted meddling kids!"
-- Mr. Carswell