All episodes from the first nine seasons of the us sitcom the series revolves around two university physicists leonard johnny galecki and sheldon jim parsons their beautiful free spirited neighbour penny kaley cuoco sweeting and their friends howard simon helberg and rajesh kunal nayyar season 1 episodes are pilot the big bran hypothesis the fuzzy boots corollary the luminous fish effect the hamburger postulate the middle earth paradigm the dumpling paradox