In a new behind-the-scenes video from CBS, "Supergirl" stars Melissa Benoist (Kara Zor-El), Chyler Leigh (Alex Danvers) and David Harewood (Hank Henshaw) shared their excitement about the first day of shooting.

"It's the first day of school," Benoist laughed. "I couldn't sleep last night like it was Christmas Eve!"

"This is kind of the opening sequence of the whole series," Harewood revealed. "We're testing Supergirl with her abilities of speed and flying, while at the same time trying to blow her up."

The show centers on Kara Zor-El, a Kryptonian stranded on Earth following the destruction of her home planet Krypton. Assuming the name Kara Danvers, she decides to come out of hiding at the age of 24 and really use her super abilities for good.

"Supergirl" arrives on CBS on October 26 at 8:30 p.m. EST. Developed by producers Greg Berlanti, Ali Adler and Andrew Kreisberg, the series stars Benoist, Calista Flockhart, Harewood and Leigh.