Season 4 (Supergirl)

The fourth season of premiered on October 14, 2018, on The CW and concluded on May 19, 2019. The season consisted of 22 total episodes during its run.

Main Cast

 * Melissa Benoist as Supergirl (Kara Danvers) / Red Daughter/Linda Lee
 * Mehcad Brooks as Guardian (James "Jimmy" Olsen) / Jimmy
 * Chyler Leigh as Alex Danvers & Alex Danvers
 * Katie McGrath as Lena Luthor
 * Jesse Rath as Brainiac 5/Barney Fife (Querl Dox)
 * Sam Witwer as Agent Liberty (Ben Lockwood)
 * Nicole Maines as Dreamer (Nia Nal)
 * April Parker Jones as Lauren Haley
 * David Harewood as Martian Manhunter (J'onn J'onzz)

Recurring Cast

 * Lynda Carter as President Olivia Marsdin
 * Jon Cryer as Lex Luthor
 * Brenda Strong as Lillian Luthor
 * Rhona Mitra as Mercy Graves
 * Robert Baker as Metallo (Otis Graves)
 * Tiya Sircar as Fiona Byrne
 * Anthony Konechny as Parasite (Raymond Jensen)
 * Jaymee Mak as Mackenzie
 * Bruce Boxleitner as (Vice) President Phil Baker
 * Andrea Brooks as Eve Teschmacher
 * Sarah Smyth as Lydia Lockwood
 * Graham Verchere as George Lockwood
 * David Ajala as Manchester Black
 * Donna Benedicto as Agent Reiff
 * Steve Byers as Tom
 * Roxy Wood as Yvette Turner
 * Jessica Meraz as Menagerie (Pamela Ferrer)
 * Louis Ozawa Changchien as Hat
 * Azie Tesfai as Kelly Olsen
 * Françoise Robertson as Sarah Walker

Soundtrack
On June 4, 2021, an album consisting of incidental music from the season was released digitally on Spotify and Amazon Music.