CBS, Thursdays at 8 p.m.
Talk about boldly going. Thanks to saturation airplay in late-night reruns, the nerds of The Big Bang Theory are now huger than ever. They continue to defy every law of show-biz science by charming the masses with ridiculously arcane jokes about experimental physics. And the Green Lantern. And brisket. As the sixth season begins, newlywed Wolowitz (Simon Helberg) orbits in outer space. (Will his mother still torment him there? Of course she will!) Meanwhile on earth, Jim Parsons and Mayim Bialik are one of TV's most compellingly anti-romantic couples.