Gremlin Gus was created in the 1940s for an unfinished animated film based on Roald Dahl's story, The Gremlins. Though the film was never made, there was a Disney illustrated version of Dahl's story and he and his fellow Gremlins appeared on various World War II insignias with other Disney characters. In recent years, the book was republished and Gus took on a prominent role in Epic Mickey as Mickey's sidekick and conscience.