<P> The series follows siblings Kate, Kevin and Randall as their lives intertwine . Kate and Kevin were originally part of a triplet pregnancy, conceived in the bathroom of Froggy's, a bar, during Super Bowl XIV . Their due date was October 12, 1980, but they were born six weeks early on August 31; their biological brother was stillborn . Their parents, Jack and Rebecca, having expected to bring home three babies, decide to adopt another newborn: Randall, a black child born the same day and brought to the same hospital after his biological father abandoned him at a fire station . </P> <P> Episodes weave through the stories of the past and present of the characters, with most scenes taking place in 1980, 1989--1995, and the present day (2016--2017). Flashback scenes take place in Pittsburgh, while current scenes are typically split between Los Angeles, New Jersey, and New York City . </P> <Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th_colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Rank </Th> <Th> Average viewership (in millions) </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 18 </Td> <Td_colspan="1"> September 20, 2016 (2016 - 09 - 20) </Td> <Td> March 14, 2017 (2017 - 03 - 14) </Td> <Td> 6 </Td> <Td> 14.70 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 18 </Td> <Td_colspan="1"> September 26, 2017 (2017 - 09 - 26) </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> TBA </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th_colspan="2"> Nielsen ratings </Th> </Tr>

How many episodes are in season 1 of this is us