The caveman was the third and final disguise worn by Rob.
Physical appearance[]
He is an averagely built man with messy brown hair and a beard. He wore a yellow cloth with black spots and also carried around a club.
Personality[]
He was hostile and threatening as he attacked Shaggy and Scooby with intentions of hitting them with his club.
History[]

Rob unmasked.
He attacked Shaggy and Scooby when they were searching for a monster to catch and lead back to the gang to trap, he chased after them through the halls of the museum until they got back to the Egyptian hall. Where Fred and Daphne lined up a long piece of rope to trip the caveman over.
After the monster was caught, Mr. Mason, the one who runs the museum, was brought over to see the captured monster, who was then unmasked revealing it to be his assistant Rob. He was trying to scare kids with dirty hands away from the museum because he was sick and tired of them touching the displays he made.
Appearances[]
- Scooby-Doo! Museum Mystery (no lines)