<Table> <Tr> <Th_colspan="2"> Designated Survivor (season 1) </Th> </Tr> <Tr> <Td_colspan="2"> DVD cover </Td> </Tr> <Tr> <Th> Starring </Th> <Td> <Ul> <Li> Kiefer Sutherland </Li> <Li> Natascha McElhone </Li> <Li> Adan Canto </Li> <Li> Italia Ricci </Li> <Li> LaMonica Garrett </Li> <Li> Tanner Buchanan </Li> <Li> Kal Penn </Li> <Li> Maggie Q </Li> </Ul> </Td> </Tr> <Tr> <Th> Country of origin </Th> <Td> United States </Td> </Tr> <Tr> <Th> No. of episodes </Th> <Td> 21 </Td> </Tr> <Tr> <Th_colspan="2"> Release </Th> </Tr> <Tr> <Th> Original network </Th> <Td> ABC </Td> </Tr> <Tr> <Th> Original release </Th> <Td> September 21, 2016 (2016 - 09 - 21)--May 17, 2017 (2017 - 05 - 17) </Td> </Tr> <Tr> <Th_colspan="2"> Season chronology </Th> </Tr> <Tr> <Td_colspan="2"> Next → Season 2 </Td> </Tr> <Tr> <Td_colspan="2"> List of Designated Survivor episodes </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Designated Survivor (season 1) </Th> </Tr>

How many episodes in designated survivor season 1