Season 4 (Supergirl)

Supergirl was renewed for a fourth season by The CW on April 2, 2018. It will premiere on October 14, 2018.

Main cast

 * Melissa Benoist as Kara Danvers/Supergirl
 * Mehcad Brooks as James Olsen
 * Chyler Leigh as Director Alex Danvers
 * Katie McGrath as Lena Luthor
 * Jesse Rath as Querl Dox/Brainiac 5
 * Sam Witwer as Ben/Agent Liberty
 * Nicole Maines as Nia Nal/Dreamer
 * April Parker Jones as Colonel Haley
 * David Harewood as J'onn J'onzz

Recurring cast

 * Jeremy Jordan as Winn Schott
 * David Ajala as Machester Black

Confirmed plot points

 * There will be a crossover with The Flash and Arrow. The crossover will introduce Batwoman and Gotham City.

Confirmed new characters

 * Nia Nal: A confident, wunderkind of a fashionista. Once a political speechwriter, Nia is the newest addition to the CatCo investigative reporting team. With her she brings sparkling wit and biting humor but under that banter-y, chic facade, lays a soulful young woman who has much to offer the world. She is also Transgender.
 * Ben/Agent Liberty: A businessman whose success has burned down to the ground. Blaming others for his failure and not having his back, he is now making it his life goal to correct those wrongs. Be careful of his dangerous ability to persuade people as he has no problem using that as a method to accomplish his goals. Deeply evil — founder of Children of Liberty, an anti-alien hate group dedicated to establishing humans as the superior race. According to the show’s producers, he conceals his vile nature “in the guise of a family man,” making it all the more difficult to take him down.
 * Colonel Haley: Her actions make it clear that she is someone you don’t want to mess with, without her having to say a word. She is loyal to her commanding officer as well as her country by making sure she puts its best interest ahead of her own.
 * Chester Green: He has a dark background that has now put a heavy burden on his shoulders. In missions, however, his charm is so strong that it ends up helping him avoid the brutality of the situation.

Trivia

 * This season will air on Sundays at 8/7c, as opposed to the past three seasons, where it aired on Mondays at the same time.