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Young Sherlock Season 1

Season 3

As season three returns with all-new supercharged adventures this fall, Kara and team will come up against a new threat in the form of DC Worldkiller, Reign.

201723 EpisodesDrama, Sci-Fi & Fantasy, Action & Adventure

Cast & Crew

Mehcad Brooks

Mehcad Brooks

James 'Jimmy' Olsen / Guardian

Odette Annable

Odette Annable

Samantha Arias / Reign

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

Jeremy Jordan

Jeremy Jordan

Winn Schott

Chris Wood

Chris Wood

Mon-El

Episode Guide

Kara deals with the loss of Mon-El by focusing all her energy on being Supergirl and the mysterious new threat against National City. Alex confesses a secret to Maggie about their impending nuptials. A citizen of National City has a mysterious connection to Kara, and Lena makes a bold move.

Season 3 FAQs

The cast of Season 3 includes Mehcad Brooks as James 'Jimmy' Olsen / Guardian, Odette Annable as Samantha Arias / Reign, David Harewood as J'onn J'onzz / Martian Manhunter, Chyler Leigh as Alex Danvers / Sentinel, Melissa Benoist as Kara Danvers / Supergirl / Kara Zor-El, Katie McGrath as Lena Luthor, Jeremy Jordan as Winn Schott, and Chris Wood as Mon-El.