CBS’ idea of possibly expanding its Thursday comedy block to two hours passed the litmus test last night as a repeat Big Bang Theory (3.0/8) topped all original competition at 9 PM and a 2 Broke Girls rerun (2.1/6) finished tied for second at 9:30 PM. Last night also delivered good news for CBS’ perennial bubble comedy/utility player Rules Of Engagement (2.7/8), which proved it can stand on its own by matching its demo result from last week despite its lead-in shrinking dramatically from a 4.2/14 18-49 fast national for an original Big Bang last Thursday to a 2.8/9 for a repeat last night. At 10 PM, Person Of Interest (1.8/5) also did decent business for a repeat, doubling the original delivery of NBC’s doomed new drama Awake (0.9/2).

With Big Bang a repeat and some drama surrounding the use of the judges “save”, Fox’s American Idol (4.2/12) was up 8% from last week’s fast national. Touch (2.3/6) may have bottomed out, even with last Thursday after a couple weeks of declines. Fox (3.2/9, 11.8 million total viewers) won the night in 18-49 and total viewers.

ABC’s Missing (1.4/4) was flat with last week’s fast national, down a tenth from the final. Grey’s Anatomy (2.9/8) was up a tenth. In its second week, Scandal (2.1/6) was even with the fast national for its premiere, up a tenth from the final. NBC’s lineup was mostly higher from last week’s string of series lows. Community (1.4/5) was up a tenth (8%), 30 Rock (1.4/4) was up two tenths (17%). Anchor The Office (2.1/6) came back from a long hiatus down 13% from its most recent original four weeks ago. The Office‘s return came just in time for the season finale of Up All Night (1.5/4), helping the freshman comedy to a 25% boost from last week when it followed an Office repeat. NBC (1.3/4) once again finished the night behind Univision (1.5/4) in 18-49. The CW aired repeats.