Kunal Nayyar and Melissa Rauch

CBS topped Thursday, led by The Big Bang Theory

The comedy drew 18.6 million viewers and a 5.2 in the adults 18-to-49 demographic, on par with last week. Two and a Half Men (8.6 million, 2.1) was also flat, while the rest of CBS' lineup inched up a few tenths.

Fall TV Report Card: How's the new class doing?

ABC took second, but Once Upon a Time in Wonderland (3.5 million, 0.9) and Grey's Anatomy (8.5 million, 2.5) both hit new series lows. Scandal (8.8 million, 2.9) was even.

On NBC, Parks and Recreation (2.8 million, 1.0) also hit an all-time low with its two episodes, while  Sean Saves the World (3 million, 0.9), The Michael J. Fox Show (2.8 million, 0.9) and Parenthood (3.6 million, 1.2) were flat.

Fox's and The CW's lineups were all up, but are inflated from football pre-emptions.

8 p.m.
CBS: The Big Bang Theory 18.6 million (5.2); The Millers 12 million (2.8)
ABC: Once Upon a Time in Wonderland 3.5 million (0.9) 
Fox: The X Factor 5.9 million (1.6)  
NBC: Parks and Recreation 2.8 million (1.0) [8-9 p.m.]
CW: The Vampire Diaries 2.9 million (1.3)

9 p.m.
CBS: The Crazy Ones 8.7 million (2.2)Two and a Half Men 8.6 million (2.1) 
ABC: Grey's Anatomy 8.5 million (2.5) 
Fox: Glee 4.4 million (1.6)
NBC: Sean Saves the World 3 million (0.9); The Michael J. Fox Show 2.8 million (0.9)
CW: Reign 2.2 million (0.9)

10 p.m.
CBS: Elementary 9.1 million (1.8)
ABC: Scandal 8.8 million (2.9)
NBC: Parenthood 3.6 million (1.2)