That '70s Show is a film sitcom.
Donald `` Don '' Stark ( born July 5 , 1954 ) is an American actor known for his role as Bob Pinciotti on the Fox Network sitcom That '70s Show for all eight seasons ( 19982006 ) and fictional Los Angeles Devils owner Oscar Kinkade in VH1 's Hit the Floor . That '70s Show . 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 .