Fight or Flight

Fight or Flight is the third episode of the first season of Supergirl and the third episode overall.

Synopsis
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.

Main Cast

 * Melissa Benoist as Kara Danvers/Supergirl
 * Mehcad Brooks as James Olsen
 * Chyler Leigh as Alex Danvers
 * Jeremy Jordan as Winn Schott
 * David Harewood as J'onn J'onzz
 * Calista Flockhart as Cat Grant

Special Recurring Cast

 * Peter Facinelli as Maxwell Lord

Special Guest Cast

 * Jenna Dewan Tatum as Lucy Lane

Guest Cast

 * Chris Browning as Ben Krull/Reactron