In "Fight or Flight," the third episode of "Supergirl's" debut season, Kara (Melissa Benoist) will have to face not only Reactron but also Maxwell Lord (Peter Facinelli) and Lucy Lane (Jenna Dewan-Tatum), Jimmy Olsen's ex. What's more, her boss, Cat Grant (Calista Flockhart) intends on running an expose on Supergirl -- complete with a Supergirl-themed gala.

"Fight or Flight" - Supergirl's powers are tested when Reactron, one of Superman's formidable enemies, arrives in National City and targets the young hero. Also, Cat plans to run an expose on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Peter Facinelli guest stars as tech entrepreneur Maxwell Lord.

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, David Harewood and Chyler Leigh.