CBS’ Supergirl took flight on Monday with 13 million viewers and a 3.1 rating (per finals) leading out of The Big Bang Theory — thus revealing its secret identity as the fall’s No. 1 series debut in total audience while tying the launch of NBC’s Blindspot in the coveted 18-49 demo.

TVLine readers gave the well-reviewed superhero series an average grade of “B+.”

For reference, this fall’s other series debuts included:

Blindspot, NBC: 10.6 mil/3.1 (leading out of The Voice)

Life in Pieces, CBS: 11.3 mil/2.6 (leading out of Big Bang)

Rosewood, Fox: 7.5 mil/2.4 (leading into Empire premiere)

Heroes Reborn, NBC: 6.6 mil/2.1

Quantico, ABC: 7.9 mil/1.9

Limitless, CBS: 9.9 mil/1.9 (leading out of the NCISes)

Code Black, CBS: 8.6 mil/1.5

Blood & Oil, ABC: 6.4 mil/1.4

The Player, NBC: 4.9 mil/1.2

Minority Report, Fox: 3.1 mil/1.1

Opening the Eye’s night, Big Bang (16.3 mil/4.4) was up five tenths, while the supersized post-Supergirl Scorpion (9.6 mil/1.9) ticked up.

Elsewhere in the ratings….

ABC | Dancing With the Stars (11.9 mil/1.8) dipped a tenth. For those who will “wonder,” the Castle repeat did 4.5 mil/0.8.

NBC | The Voice (11.9 mil/3.1) ticked up, Blindspot (7.9 mil/2.1) was flat.

FOX | Gotham (4.3 mil/1.5) rose two tenths, Minority Report (1.9 mil/0.6) was flat.

THE CW | Crazy Ex-Girlfriend (670K/0.2) and Jane the Virgin (940K/0.3) each dipped a precious tenth.

Want scoop on any of the above shows? Email insideline@tvline.com and your question may be answered via Matt’s Inside Line.