Marty was the bellhop at Mr. MacDuff's Hotel Mansion.
Physical appearance[]
Marty is a thin man with brown hair, he wore red bellhop uniform with black pants that have yellowish-white stripes on them.
Personality[]
He's a rather calm person who was just doing his job, but was also suprised on how brave the gang was for staying at the hotel despite it being haunted. However, it turned out he had greedy intentions on making a fortune out of the goo located underneath the place.
History[]

Marty unmasked.
He was called by Mr. MacDuff and was handed keys from him to the gangs rooms when they were checking in because of a rainstorm. He was was surprised about how brave they were.
Fred asks why, and he replied saying that nobody comes to the hotel anymore do to it being haunted. After the rest of the conversation was over, he led the gang to their rooms and left afterwards.
He was later revealed to be the one responsible behind the hauntings, a rich real estate developer had told him about weird purple goo located under the hotel and had paid him into making the place look haunted by dressing up as a Ghost Clown and scaring away hotel goers, so Mr. MacDuff would sell it. That way the real estate developer would tear the place down so he and Marty would make a fortune out of the goo underneath.
He was later incarcerated after the plan was foiled and the hotel was saved, and the goo was then used for fun by Scooby, who made a statue of himself out of it.