The double-episode Season 2 premiere of CBS’ Zoo on Tuesday night averaged 5.1 million total viewers and a 0.8 rating (per finals), up 7 percent in audience from its freshman finale (4.8 mil/0.9) but hitting a series low in the demo. (The bit of summertime escapism in Season 1 averaged 6.4 mil and a 1.1, after debuting to 8.2 mil/1.2.)

With those numbers, Zoo appears to have matched the lowest ratings Person of Interest put up during its farewell run in the Tuesdays-at-10 time slot. Readers gave the premiere an average grade of “B.”

Elsewhere in the ratings…

NBC | Leading out of U.S. Olympics swimming trials (5.9 mil/1.3), America’s Got Talent (11.2 mil/2.4) was up a tenth in the demo.

THE CW | Containment (860K/0.3) was steady.

ABC | Uncle Buck (3.7 mil/1.1) and To Tell the Truth (4.1 mil/1.0) each rose a tenth.

FOX | Hotel Hell (3.1 mil/0.9) and Coupled (1.4 mil/0.5) each ticked up.

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