The Big Bang Theory” fell to a new series low in the 18-49 demo on Thursday night, drawing a 2.4 rating in Nielsen overnight numbers. That’s down two-tenths of a point from last week, when the show initially drew a 2.4 in overnights, then ticked up to a 2.6 when final numbers came in. At 9 p.m., “Mom” followed a “Big Bang” re-run with a 1.5, up two-tenths, followed by “Life in Pieces” (1.2, up one-tenth) and “The Amazing Race” (0.9, up two-tenths). CBS led the night in the demo, averaging a 1.4 rating and 6 share.

ABC was second with a 1.2/5. “Grey’s Anatomy” fell one-tenth at 1.7, followed by “Scandal” (1.3, down one-tenth) and “The Catch” (even at 0.6).

NBC averaged a 0.9/3. “Chicago Med” inched up one-tenth at 1.1, followed at 10 p.m. by “The Blacklist,” which was even at 0.8. The Peacock aired re-runs at 8 p.m.

Fox was fourth with a 0.7/3. “MasterChef Junior” was up one-tenth at 0.9., with Fox airing re-runs in the 9 p.m. hour.

On The CW, “Supernatural” was even at 0.5 and “Riverdale” was up one-tenth at 0.4. The network averaged a 0.4/2 on the night.