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Many of the series’ ideas originated in The Intertidal Zone, an unpublished educational book that Hillenburg created in 1989 to teach his students about undersea life. He began developing SpongeBob SquarePants into a television series in 1996 following the cancellation of Rocko’s Modern Life. He turned to Tom Kenny, who had worked with him on that series, to voice the title character. SpongeBob caution may floss at any time shirt