The CW had its best series premiere in five years with the debut of superhero spinoff "The Flash."
According to Nielsen ratings, the show was the fifth-most watched in the key 18-to-49-year-old demographic Tuesday night with a rating of 1.8.
The show, which tells the origin story of speedster Barry Allen (played by Grant Gustin), attracted about 4.5-million viewers.
The CW was originally planning on putting "The Flash" on Monday nights at 8 p.m. to start the programming week, but switched to Tuesdays to avoid competition with Fox's "Gotham."
Warner Bros. Television produces both "Flash" and "Gotham" and didn't want the comic franchises to cannibalize each other's audience. Warner Bros. owns 50% of the CW network, with CBS Corp. owning the other half.
The Season 10 premiere of "Supernatural," which followed "The Flash," drew about 2.8-million viewers. It was even with last fall's premiere with a rating of 1.2 in the key demo.
The network, known for hit shows such as "The Vampire Diaries" and "Arrow," experienced its most-watched and highest-rated (in the key demo) night in more than four years.
With a rating of 1.5 in the key demo, the CW beat ABC and Fox in viewership in the desired category. The network averaged 3.6-million viewers total.
"Selfie," which earned a rating of 1.1. in the key demo, was down 31% from last week. It averaged 3.9-million viewers.
On Fox, "New Girl" stayed even with last week with a rating of 1.3 in the key demo. It was up 8% in total viewers, averaging 2.6 million. "The Mindy Project," which drew in 2.2-million viewers, was down one-tenth from last week in the key demo with a rating of 1.0.