Jim Parsons and Johnny Galecki

The Big Bang Theory dominated Thursday with its biggest audience ever.

The comedy drew 20.1 million viewers and a 5.6 in the adults 18-to-49 demographic to post its largest viewership for a regularly scheduled episode and an 11-month high in the demo. That boosted the rest of CBS' lineup, with The Millers (13.6 million, 3.3) matching its series high.

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NBC's comedies also enjoyed bumps, albeit much smaller ones. Community(3.6 million, 1.4) rose a tenth, Parks and Recreation (3.4 million, 1.4) returned to season highs in both measures for its 100th episode, and Sean Saves the World (3.2 million, 1.0) and The Michael J. Fox Show (3.1 million, 1.0) each climbed two tenths. Parenthood (4.2 million, 1.3) was flat.

On ABC, The Taste (4.5 million, 1.3) was even, while The Assets (2.9 million, 0.6) dropped a tenth from its DOA bow.

8 p.m.
CBS: The Big Bang Theory 20.1 million (5.6); The Millers 13.6 million (3.3)
ABC: The Taste 4.5 million (1.3) [8-10 p.m.] 
Fox: Sleepy Hollow (R) 4.6 million (0.7) 
NBC: Community 3.6 million (1.4); Parks and Recreation 3.4 million (1.4)
CW: The Vampire Diaries (R) 950,000 (0.3)

9 p.m.
CBS: The Crazy Ones 9.6 million (2.4)Two and a Half Men 9.5 million (2.4) 
Fox: Sleepy Hollow (R) 2.4 million (0.6)
NBC: Sean Saves the World 3.2 million (1.0); The Michael J. Fox Show 3.1 million (1.0)
CW: Reign (R) 940,000 (0.3)

10 p.m.
CBS: Elementary 9.9 million (2.0)
ABC: The Assets 2.9 million (0.6) 
NBC: Parenthood 4.2 million (1.3)