CBS' The Big Bang Theory was Thursday's highest-rated show, while Grey's Anatomy hit a series low and Charlie's Angels plunged 20 percent. The X Factor pushed Fox to an overall win for the night, according to preliminary numbers.

While down 10 percent versus last week, The Big Bang Theory at 8 p.m. on CBS posted a 4.4/13 in the adults 18-49 demographic, giving it a win for the night, with 13.6 million total viewers. The sophomore episode of How to Be a Gentleman followed at 8:30, taking a 2.5/7 and 7.8 million total viewers. Person of Interest at 9 received a 2.5/6 and 11.4 million total viewers, while The Mentalist closed the night at 10 with a 2.7/7 and 12.8 million total viewers.

Fox aired The X Factor at 8, which was the second-highest rated show of the evening with a 3.8/10 and 11.2 million total viewers. The strong showing gave the network an overall win for the night.

ABC experienced an evening of dips, starting with Charlie's Angels at 8, which plunged 20 percent from last week to a 1.2/4 and 5.9 million total viewers. Grey's Anatomy the following hour also brought grim news, dropping 17 percent to a series low with a 3.0/8 and 8.5 million total viewers. The night closed with Private Practice at 10, which fell 21 percent for a 2.2/8 and 6.2 million total viewers.

NBC also took its lumps Thursday night. Community at 8 slid 17 percent to a 1.5/5 in the demographic and 3.3 million total viewers, followed by Parks & Recreation at 8:30, which was down 10 percent with a 1.9/5 and 4.1 million total viewers. The Office at 9 dropped 11 percent to a 3.1/8, making it the lowest-rated episode since April 2005, with 5.7 million total viewers. (It debuted in March 2005.) Whitney at 9:30 dipped 8 percent for a 2.3/6 and 4.8 million total viewers, while Prime Suspect at 10 had a 1.5/4 and 4.9 million total viewers.