‘Dance’ opens against little competish

All other networks go into repeat mode

On a night with depressed ratings across the board, Fox’s “So You Think You Can Dance” was the only original program and dominated in its eighth-season premiere.

Two-hour reality skein, which comes a day following the “American Idol” finale, drew a 3.2 rating/10 share in the 18-49 demo, with 9.1 million viewers tuning in. That was slightly up from its seventh-season debut a year ago.

Everything other primetime program was in repeat mode. CBS fared second best to Fox with “The Big Bang Theory,” “Rules of Engagement,” “CSI” and “The Mentalist.” Of those programs, “Big Bang” (2.1/7, 8.1m) was tops.

ABC offered a sampler of summer cop show “Rookie Blue,” with a pair of reruns to whet the appetite for the new season, which arrives in a few weeks. Those, however, were below an 8 o’clock “Wipeout” (1.4/5, 5m).

NBC scheduled six half-hours of comedy, with a 9 p.m. repeat of “The Office” (1.3/3, 2.7m) faring best.

Preliminary 18-49 averages for the night: Fox, 3.2/10; CBS, 1.7/5; Univision, 1.6/5; ABC, 1.0/3; NBC, 0.9/3; CW, 0.3/1.

In total viewers: Fox, 9.1 million; CBS, 8 million; ABC, 4.1 million; Univision, 3.8 million; NBC, 2.4 million; CW, 956,000.