Young Sherlock backdrop
Young Sherlock Season 1

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.

201822 EpisodesDrama, Sci-Fi & Fantasy, Action & Adventure

Cast & Crew

Sam Witwer

Sam Witwer

Ben Lockwood / Agent Liberty

Mehcad Brooks

Mehcad Brooks

James 'Jimmy' Olsen / Guardian

David Harewood

David Harewood

J'onn J'onzz / Martian Manhunter

Chyler Leigh

Chyler Leigh

Alex Danvers / Sentinel

Melissa Benoist

Melissa Benoist

Kara Danvers / Supergirl / Kara Zor-El

Katie McGrath

Katie McGrath

Lena Luthor

Jesse Rath

Jesse Rath

Querl 'Brainy' Dox / Brainiac-5

Nicole Maines

Nicole Maines

Nia Nal / Dreamer

Jen Troy

Jen Troy

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Episode Guide

Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James’ impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the DEO. Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J’onn relishes his peaceful new life, but an outing with an old friend causes him concern.