Several months later, after his split with DC, Kirby began freelancing regularly for Atlas in spite of his lingering resentment of Lieber's earlier treatment of him in the 1940s.[59] Because of the poor page rates, Kirby would spend 12 to 14 hours daily at his drawing table at home, producing eight to ten pages of artwork a day.[60] His first published work at Atlas was the cover of and the seven-page story "I Discovered the Secret of the Flying Saucers" in Strange Worlds #1 (Dec. 1958). Initially with Christopher Rule as his regular inker, and later Dick Ayers, Kirby drew across all genres, from romance comics to war comics to crime comics to Westerns, but made his mark primarily with a series of supernatural-fantasy and science fiction stories featuring giant, drive-in movie-style monsters with names like Groot, the Thing from Planet X; Grottu, King of the Insects; and Fin Fang Foom for the company's many anthology series, such as Amazing Adventures, Strange Tales, Tales to Astonish, Tales of Suspense, and World of Fantasy.[11] His bizarre designs of powerful, unearthly creatures proved a hit with readers. Additionally, he also freelanced for Archie Comics' around this time, reuniting briefly with Joe Simon to help develop the series The Fly and The Double Life of Private Strong. Additionally, Kirby drew some issues of Classics Illustrated.[11]