Captain Crook was the McDonald’s advertising character associated with fish-themed promotions and the Filet-O-Fish.
Captain Crook was designed as a pirate-like member of McDonaldland’s character group. His identity connected him with seafood and the restaurant’s fish sandwich, giving McDonald’s a way to promote the Filet-O-Fish through a recurring personality rather than through product-only advertising.
The character appeared alongside other McDonaldland figures during the era when the fictional community was central to McDonald’s family marketing. His pirate styling made the seafood association visually obvious and differentiated him from the Hamburglar, another character whose identity involved taking food.
Captain Crook is sometimes mistaken for Officer Big Mac because both were costumed, role-based characters. Their branding functions were different: Captain Crook was the fish-themed pirate, while Officer Big Mac was associated with law and order in McDonaldland.