Captain Crook was the McDonald's advertising character associated with the Filet-O-Fish sandwich.
Captain Crook appeared in McDonaldland advertising as a pirate-themed character connected with the Filet-O-Fish. His costume and nautical identity supported the seafood positioning of the sandwich, giving the product a distinct character within McDonald's wider fictional advertising world.
He belonged to the same broad family of McDonaldland figures as Ronald McDonald, Grimace, the Hamburglar, and Mayor McCheese. Each character gave a different personality or story function to the brand, while Captain Crook helped make one menu item especially memorable.
Captain Crook is sometimes confused with the Hamburglar because both were comic troublemakers. Their product associations were different: Captain Crook was linked to Filet-O-Fish, while the Hamburglar was defined by attempts to steal hamburgers.