Supergirl Debuts to Super Ratings on CBS

Melissa Benoist stars in "Supergirl" on CBS, which made its debut Monday to strong ratings, coming in tied for second with NBC's "The Voice" for the night (Photo by CBS).

LOS ANGELES - CBS's "Supergirl" debuted to super ratings Monday night with 12.9 million total viewers and a 3.2 demo rating with make Supergirl this fall’s number 1 series premiere.

Airing in the 8:30 to 9:30 p.m., it retained 70 percent of the young-adult audience for “The Big Bang Theory” in the 8 p.m. half-hour. The show, starring Melissa Benoist was tied with NBC’s “The Voice” as No. 2, just behind “Big Bang” among Monday’s entertainment series. But next week, it won't have "Big Bang" as a lead-in when it takes the 8 p.m. Monday slot opposite Monday powerhouse, "The Voice."

Supergirl tells the story of Superman's cousin, office assistant Kara Danvers, who must often battle her overbearing boss, Cat Grant, played by Calista Flockhart.

The show was developed by Ali Adler ("Chuck"), Greg Berlanti ("The Flash") and Andrew Kreisberg ("The Flash") for Berlanti Productions and CBS.