The Big Bang Theory kicked off 2013 with a huge, well, bang.

The CBS sitcom hit a viewership series high, drawing 19 million viewers Thursday, and matched a series high in the 18-to-49 demographic with a 6.0 rating.

Winter TV: Get the scoop on your favorite returning shows

That boosted Two and a Half Men (15.4 million, 4.6) to season …

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