Duncan Grimm is the great-grandson of Angus Grimm, a notorious pirate.
Physical appearance[]
Duncan is an overweight man with brown hair and a big chin. He is only seen wearing an all brown pirate outfit to mimic the statue of his great-grandfather.
Personality[]
He was insecure about his family legacy getting used by the public and hated it getting shamed on,like them having Grimm as the last name.
History[]
Scooby-Doo! Beginner Mysteries[]
After hearing that Greg Hibbard, a friend of Fred Jones, was going to turn his great-great grandfathers ship into a museum, he conducted a scheme to prevent him not to do it.
He teamed up with three other people that dressed as Skeletons while he pretended to be a living statue of his great-grandfather Angus Grimm (also hiding the actual statue in a nearby closet), installed black lights around the ship like the sails to give a creepy vibe, and hide the blackness around the skeleton costumes.
Duncan unmasked.
His plan was soon foiled after him and his men were knocked onto a lifeboat and scared into giving in after seeing Shaggy about to throw a cannonball onto the boat (which he pretended to), and they were all forced to sit there awaiting their arrest.