<Table> <Tr> <Th_colspan="2"> The Secret Circle </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Genre </Th> <Td> Supernatural drama Teen drama Horror </Td> </Tr> <Tr> <Th> Based on </Th> <Td> The Secret Circle by L.J. Smith </Td> </Tr> <Tr> <Th> Developed by </Th> <Td> Andrew Miller </Td> </Tr> <Tr> <Th> Starring </Th> <Td> <Ul> <Li> Britt Robertson </Li> <Li> Thomas Dekker </Li> <Li> Gale Harold </Li> <Li> Phoebe Tonkin </Li> <Li> Shelley Hennig </Li> <Li> Jessica Parker Kennedy </Li> <Li> Ashley Crow </Li> <Li> Louis Hunter </Li> <Li> Natasha Henstridge </Li> <Li> Chris Zylka </Li> </Ul> </Td> </Tr> <Tr> <Th> Country of origin </Th> <Td> United States </Td> </Tr> <Tr> <Th> Original language (s) </Th> <Td> English </Td> </Tr> <Tr> <Th> No. of seasons </Th> <Td> </Td> </Tr> <Tr> <Th> No. of episodes </Th> <Td> 22 (list of episodes) </Td> </Tr> <Tr> <Th_colspan="2"> Production </Th> </Tr> <Tr> <Th> Executive producer (s) </Th> <Td> <Ul> <Li> Kevin Williamson </Li> <Li> Leslie Morgenstein </Li> <Li> Andrew Miller </Li> <Li> Gina Girolamo </Li> </Ul> </Td> </Tr> <Tr> <Th> Producer (s) </Th> <Td> Liz Friedlander Supervising producers Don Whitehead Holly Henderson </Td> </Tr> <Tr> <Th> Location (s) </Th> <Td> Vancouver, British Columbia, Canada </Td> </Tr> <Tr> <Th> Running time </Th> <Td> 42 minutes </Td> </Tr> <Tr> <Th> Production company (s) </Th> <Td> <Ul> <Li> Outerbanks Entertainment </Li> <Li> Alloy Entertainment </Li> <Li> CBS Television Studios </Li> <Li> Warner Bros. Television </Li> </Ul> </Td> </Tr> <Tr> <Th> Distributor </Th> <Td> Warner Bros. Television Distribution </Td> </Tr> <Tr> <Th_colspan="2"> Release </Th> </Tr> <Tr> <Th> Original network </Th> <Td> The CW </Td> </Tr> <Tr> <Th> Picture format </Th> <Td> 1080i (HDTV) </Td> </Tr> <Tr> <Th> Original release </Th> <Td> September 15, 2011 (2011 - 09 - 15)--May 10, 2012 (2012 - 05 - 10) </Td> </Tr> <Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Td_colspan="2"> Website </Td> </Tr> </Table> <Tr> <Th_colspan="2"> The Secret Circle </Th> </Tr>

How many episodes of the secret circle are there