<Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Td_colspan="2"> Website </Td> </Tr> <P> That' 70s Show is an American television period sitcom that originally aired on Fox from August 23, 1998 to May 18, 2006 . The series focused on the lives of a group of six teenage friends living in fictional Point Place, Wisconsin from May 17, 1976 to December 31, 1979 . </P> <P> The main teenage cast members were Topher Grace, Mila Kunis, Ashton Kutcher, Danny Masterson, Laura Prepon and Wilmer Valderrama . The main adult cast members were Debra Jo Rupp, Kurtwood Smith, Don Stark, Tommy Chong and Tanya Roberts . </P>

When did the first that 70 show air