Double-O Duck and Mata Harrier are two antropomorphic ducks who form a secret-agent duo. They were created by Dick Kinney and Al Hubbard in the same age when this creative duo of comic artists developed other important characters for Disney comics, such as Fethry Duck and Hard Haid Moe. Double-O Duck's name is a play on "007" (a.k.a. "James Bond") while Mata Harrier's one is an obvious play on "Mata Hari". They appeared for the first time in the story "The Case of the Purloined Pearls", where they fought against agents of the evil organization "BLONK". Then the agents of this organization became the traditional rivals of Double-O Duck and Mata Harrier in their subsequent stories. Most part of their comic stories were created by Brazilian cartoonists.