Captain Crook was the McDonaldland character associated with McDonald's Filet-O-Fish sandwich.
Captain Crook was created as one of the recurring characters in McDonaldland, the fictional advertising setting introduced in 1971. His pirate identity connected him with seafood imagery and the Filet-O-Fish product, giving McDonald's a character-based way to advertise a menu item that differed from its hamburger-centered image.
The character is often mixed up with the Hamburglar because both were mischievous figures in the same advertising universe. Their product associations were different: the Hamburglar was linked to hamburgers, while Captain Crook was linked to Filet-O-Fish sandwiches.
Captain Crook was one part of a larger branding strategy in which individual characters represented products, places, or ideas within McDonaldland. The approach helped McDonald's make menu advertising more memorable, particularly for children, by turning food categories into recognizable personalities.