Season 4
In season four, Supergirl is facing a bigger threat than she's ever faced before – a new wave of anti-alien sentiment, spreading across National City that’s fomented by Agent Liberty. As Kara mentors a new reporter at CatCo, Nia Nal, and tries to use the power of the press to shine a light on the issues threatening to tear the city apart, Supergirl takes to the skies to battle the many villains who rise up in this era of divisiveness.
Episodes
1 American Alien Oct 14, 2018 
2 Fallout Oct 21, 2018 
3 Man of Steel Oct 28, 2018 
4 Ahimsa Nov 4, 2018 
5 Parasite Lost Nov 11, 2018 
6 Call to Action Nov 18, 2018 
7 Rather the Fallen Angel Nov 25, 2018 
8 Bunker Hill Dec 2, 2018 
9 Elseworlds (III) Dec 11, 2018 
10 Suspicious Minds Jan 20, 2019 
11 Blood Memory Jan 27, 2019 
12 Menagerie Feb 17, 2019 
13 What's So Funny About Truth, Justice, and the American Way? Mar 3, 2019 
14 Stand and Deliver Mar 10, 2019 
15 O Brother, Where Art Thou? Mar 17, 2019 
16 The House of L Mar 24, 2019 
17 All About Eve Mar 31, 2019 
18 Crime and Punishment Apr 21, 2019 
19 American Dreamer Apr 28, 2019 
20 Will The Real Miss Tessmacher Please Stand Up? May 5, 2019 
21 Red Dawn May 12, 2019 
22 The Quest for Peace May 19, 2019