THE BIG BANG THEORY
CBS, 8:00 p.m. ET
SEASON PREMIERE: To begin Season 9 of TV’s most popular comedy, romance is in the air – and some of that air has turned sour. Things seem to be going well for Penny and Leonard (Kaley Cuoco-Sweeting, Johnny Galecki), because they’re committing to an impulsive wedding in Las Vegas – but not so well for Sheldon and Amy (Jim Parsons, Mayim Bialik), who are taking some time apart from one another. But by the end of the episode, expect something to shift, somewhere…