“Fight or Flight” — Cat plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured: Jeremy Jordan Photo: Trae Patton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“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, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Mehcad Brooks and Jenna Dewan-Tatum Photo: Trae Patton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“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, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Mehcad Brooks, Jenna Dewan-Tatum and Melissa Benoist Photo: Trae Patton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“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, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Mehcad Brooks, Jenna Dewan-Tatum and Melissa Benoist Photo: Trae Patton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“Fight or Flight” — Cat plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Melissa Benoist and Calista Flockhart Photo: Trae Patton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“Fight or Flight” — Cat plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Melissa Benoist and Calista Flockhart Photo: Trae Patton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“Fight or Flight” — Cat plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Melissa Benoist and Jeremy Jordan Photo: Cliff Lipson/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“Fight or Flight” — Cat plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Melissa Benoist and Jeremy Jordan Photo: Cliff Lipson/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“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, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured: Melissa Benoist (center) Photo: Cliff Lipson/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“Fight or Flight” — Cat (Calista Flockhart, pictured) plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Photo: Cliff Lipson/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“Fight or Flight” — Cat plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Melissa Benoist, Jeremy Jordan and Calista Flockhart Photo: Cliff Lipson/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“Fight or Flight” — Cat plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured: Jeremy Jordan Photo: Cliff Lipson/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“Fight or Flight” — Cat plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Melissa Benoist and Jeremy Jordan Photo: Cliff Lipson/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“Fight or Flight” — Cat plans to run an exposé on Supergirl, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Melissa Benoist and Mehcad Brooks Photo: Cliff Lipson/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

“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, on SUPERGIRL, Monday, Nov. 9 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured: Melissa Benoist Photo: Cliff Lipson/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved

Official Synopsis:

“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 exposé 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.

Stars: Melissa Benoist as Kara Danvers/Supergirl, Calista Flockhart as Cat Grant, Chyler Leigh as Alex Danvers, Mehcad Brooks as James Olsen, David Harewood as Hank Henshaw and Jeremy Jordan as Winslow “Winn” Schott.

Guest stars: Jenna Dewan-Tatum (Lucy Lane), Chris Browning (Ben Krull/Reactron), Jay Jackson (Male Newscaster), Briana Venskus (Agent Vasquez), John Churchill (Second Engineer), Majeed Nami (An Engineer), Pilar Holland (Female Newscaster), Nischelle Turner (Morning Talk Show Host), Nerlyn Jean  (Waitress), Joshua Triplett  (Passenger).

“Fight or Flight” was written by Michael Grassi and Rachel Shukert. Directed by Dermott Downs.

‘Supergirl’ will premiere on October 26th at 8:30-9:30pm before it moves to its primetime 8-9pm time slot on November 2nd.