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As a distinctive but inoffensive exclamation, it has been widely used as a catchphrase in popular fiction, including the works of Mark Twain, the Rathbone–Bruce Sherlock Holmes films (said by Dr. Watson), Silver Age comics (especially Superman), the Rocky Horror Picture Show, and the Back to the Future films (Dr. Emmett Brown).
Hope's oeuvre is populated by superheroes from the Golden and Silver Age of Comics — Flash Gordon, Batman, Superman, and Wonder Woman — and such futuristic objects as spaceships, laser beams and fantastic uniforms.