Glenn Howerton’s “A.P. Bio” did not return as head of the class Thursday night when its Season 2 premiere settled for a 0.5 rating in the all-important adults 18-49 demographic, according to preliminary Nielsen data.

Meanwhile, the sophomore start of ABC’s Shonda Rhimes-produced legal drama “For the People” got slightly higher marks in the key demo than the NBC sitcom (managing a 0.6 rating) but was by no means the star of broadcast’s primetime student body.

CBS was first in ratings with a 1.3 rating/6 share in the advertiser-coveted 18-49 demo and in total viewers with an average of 8.3 million, according to preliminary numbers. At 8 p.m., “The Big Bang Theory,” scored a 2.1/10 and 12.8 million viewers. At 8:30, “Young Sheldon” landed a 1.7/8 and 11.5 million viewers. “Mom” at 9 put up a 1.2/6 and 8.4 million viewers. At 9:30, “Fam” received a 0.9/4 and 5.7 million viewers. “S.W.A.T.” at 10 had a 0.9/5 and 5.6 million viewers.

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ABC was second in ratings with a 1.0/5 and in viewers with 5.1 million. At 8 p.m., “Grey’s Anatomy” earned a 1.5/7 and 6.6 million viewers. At 9, “Station 19” posted a 1.0/4 and 5.4 million viewers. The “For the People” Season 2 premiere at 10 got the previously noted 0.6 rating, along with a 3 share and 3.2 million viewers.

NBC and Fox tied for third ratings, each with a 0.6/3. Fox was fourth in viewers with 2.5 million and NBC was fifth with 2.4 million.

For Fox, “Gotham” at 8 managed a 0.6/3 and 2.1 million viewers. At 9, “The Orville” closed primetime with a 0.6/3 and 2.9 million viewers.

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For NBC, “Superstore” at 8 received a 0.8/4 and 3.1 million viewers. At 8:30, “A.P. Bio” returned for its second season with the 0.5 rating noted above, along with a 3 share and 1.9 million viewers. At 9, “Brooklyn Nine-Nine” settled for a 0.6/3 and 2 million viewers. At 9:30, “Will & Grace” had a 0.7/3 and 2.6 million viewers. NBC closed primetime with a repeat of “Law & Order: SVU”

Univision was fifth in ratings with a 0.5/2 and in viewers with 1.4 million.

Telemundo was sixth in ratings with a 0.4/2 and in viewers with 1.2 million.

The CW was seventh in ratings with a 0.3/1 and in viewers with 1.1 million. At 8, “Supernatural” got a 0.4/2 and 1.3 million viewers. At 9, “Legacies” had a 0.2/1 and 852,000.