Kunal Nayyar and Simon Helberg Kunal Nayyar and Simon Helberg

The Big Bang Theory really is bigger than ever.

The CBS hit surged to an all-time high audience of 17.4 million viewers and a season-high 5.5 in the adults 18-to-49 demographic Thursday. That boosted lead-outs Two and a Half Men (13.9 million, 4.1) and Person of Interest (14.5 million, 3.1) to season highs in their respective demos. Elementary (10.7 million, 2.3) was up a tenth.

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