He was voiced by Dee Bradley Baker.
After Scooby-Doo accidentally stumbles on a treasure map while eating the pizza that he and Shaggy had ordered, Ye Phantom Parrot attacks the gang while hanging out in their treehouse. This unprovoked attack sends them into solving the mystery behind the map and they beginning to follow Ye Phantom Parrot to a lighthouse where they find clues to who is behind the ghost.
The gang is back in their treehouse watching TV where there is a news report on their capture of Stu Stukowski, and begins discussing about the map, which the news reporter confirms is curse. Velma discovers that part of the map is missing and realizes that earlier on Scooby unintentionally eats the missing piece when he found it in his pizza. Using an X-ray machine to scan the missing piece from Scooby's stomach and restore it to the map, the gang use it to find the hidden treasure of his Gnarlybeard.
Once they reach the "X" the gang split up while Shaggy and Scooby dig up at the spot where they discover another "X" this time glowing. The "X" triggers a spring that shoots Shaggy and Scooby right onto the ghost ship of none other then the ghost of Gnarlybeard himself. Gnarlybeard takes Shaggy and Scooby hostage and makes them swab the deck, while Velma, Daphne and Fred follow after in one of Daphne's dad's planes he just happens to have conveniently placed where they could find it.
Shaggy and Scooby finally escape from Gnarlybeard and come to rest on the island the ship was heading for. They soon meet up with Velma, Daphne, and Fred and they continue to look for the treasure. But when they reach the spot where the treasure is hidden, Gnarlybeard has already began digging up the treasure, Velma then figures out who the culprit is and the gang set a trap to capture him, but when the plan is moved into action, Shaggy and Scooby are accidentally caught instead and Gnarlybeard continues to pursue Velma, Daphne, and Fred. While stuck in the net of their trap, Shaggy and Scooby actually begin throwing coconuts at Gnarlybeard and knock him unconscious. With Gnarlybeard captured the gang reveal that it was Shirley, Stu's sister behind the mask. The gang then open the treasure chest to discover that it was nothing more then bottles of shampoo for Gnarlybeard's beard of which he never would have used as revealed earlier in the film that he liked to have his beard dirty.
The gang return to the treehouse, and Shaggy and Scooby are taking a bath with the bottles of shampoo they had recovered from the chest.
He is a giant, overweight green anthropomorphic parrot with a yellow beak and feet, a red bandana, a black vest, thick hairy eyebrows, and an eyepatch, a dark green belly and eyelids, a silver hook on his right wing, and gold earrings.