Captain Crook represented McDonald's Filet-O-Fish product in McDonaldland advertising.
The character was a pirate-themed figure introduced during the era when McDonald's built a large cast of fictional mascots. His name, costume, and nautical presentation connected him with the fish sandwich and its seafood imagery.
Captain Crook appeared alongside characters such as Ronald McDonald, Mayor McCheese, the Hamburglar, and Grimace. Like other McDonaldland figures, he helped turn individual menu items into memorable characters for children's advertising.
Captain Crook is sometimes confused with other food-linked mascots because McDonaldland contained many characters. His specific association was the Filet-O-Fish, while the Hamburglar focused on hamburgers and other characters had different roles.