Supernatural is a series.
Castiel [ ˌkæstiˈɛl ] is a fictional character portrayed by Misha Collins on the CW Television Network 's American television series Supernatural . Supernatural is an American fantasy horror television series created by Eric Kripke . The series is filmed in Vancouver , British Columbia and surrounding areas and was in development for nearly ten years , as creator Kripke spent several years unsuccessfully pitching it . The fifth season concluded the series ' main storyline , and Kripke departed the series as showrunner .