10 Best Episodes of Supergirl - Season 3

Twenty-four-year-old Kara Zor-El, who was taken in by the Danvers family when she was 13 after being sent away from Krypton, must learn to embrace her powers after previously hiding them. The Danvers teach her to be careful with her powers, until she has to reveal them during an unexpected disaster, setting her on her journey of heroism.

Written by Sophie and last updated on jan 28, 2023.

PS: The following content contains spoilers!

PPS: I will admit that parts of this page was written with the help of AI - it makes my work so much easier to not start from a blank page!

Supergirl - S3E2

#15 - Triggers (Season 3 - Episode 2)

Psi, a thief with psychic powers, attacks National City. Able to immobilize people by tapping into their worst fears, Psi proves a formidable opponent for Supergirl. Meanwhile, James and Lena are at an impasse, and Samantha starts her new job at L-Corp.

The episode was rated 7.66 from 2984 votes.

Supergirl - S3E11

#14 - Fort Rozz (Season 3 - Episode 11)


As Reign continues to terrorize the city, Supergirl teams up with Saturn Girl, and the two recruit Supergirl’s former enemies, Livewire and Psi, to form a team for a mission to Fort Rozz to recover a prisoner who has information on how to defeat Reign once and for all. Meanwhile, Alex babysits Ruby.

The episode was rated 7.66 from 2184 votes.

Supergirl - S3E13

#13 - Both Sides Now (Season 3 - Episode 13)

The DEO captures a second Worldkiller, Purity. Supergirl and Alex use very different methods of interrogation with Purity in the hopes of finding out how to defeat Reign. However, Purity escapes and attacks the city’s subway tunnels. Meanwhile, J’onn, Winn and Mon-El band together to fix the Legion ship.

The episode was rated 7.66 from 2124 votes.

Supergirl - S3E17

#12 - Trinity (Season 3 - Episode 17)


Still reeling after learning about Lena’s secret, Supergirl asks Guardian for a favor that could alter his relationship with Lena forever. Meanwhile, with all three Worldkillers united, Supergirl and the team brace for an epic battle.

The episode was rated 7.67 from 1854 votes.

Supergirl - S3E20

#11 - Dark Side of the Moon (Season 3 - Episode 20)

Supergirl is stunned to discover that a part of Krypton survived. Meanwhile, Alex is attacked while out with Ruby, and Lena considers how far she will go to keep Reign contained.

The episode was rated 7.67 from 1739 votes.

Supergirl - S3E10

#10 - Legion of Superheroes (Season 3 - Episode 10)


Struggling to heal from her injuries inflicted by Reign, Supergirl remains in a dreamlike state, unable to be reached. Mon-El recruits one of the Legion members, Brainiac-5, to try to bring her back. Meanwhile, Reign continues her rampage on the city so the DEO teams up with the Legion of Superheroes to try to stop her.

The episode was rated 7.67 from 2263 votes.

Supergirl - S3E6

#9 - Midvale (Season 3 - Episode 6)

Kara and Alex head home to Midvale for a little R&R. While there, Kara recalls a painful memory of a childhood friend's death and how that traumatic experience brought the Danver sisters closer together.

The episode was rated 7.68 from 2494 votes.

Supergirl - S3E5

#8 - Damage (Season 3 - Episode 5)


When multiple children get sick from lead poisoning, Morgan Edge points the finger at Lena and blames her creation of the lead bomb she made to save National City from the Daxamites. While Lena knows she never intended any harm, she fears there may have been a flaw in her design, leaving her responsible. Kara teams up with Samantha to clear Lena’s name, but it turns out to be harder than they thought. Meanwhile, Alex and Maggie make a crucial decision about the future of their relationship.

The episode was rated 7.70 from 2437 votes.

Supergirl - S3E3

#7 - Far From the Tree (Season 3 - Episode 3)

Eliza throws Alex and Maggie a wedding shower, which causes Maggie to reach out to her estranged father. Supergirl joins J’onn on a personal mission.

The episode was rated 7.70 from 2845 votes.

Supergirl - S3E4

#6 - The Faithful (Season 3 - Episode 4)


Kara investigates a secretive new group whose leader, Thomas Coville, has a mysterious connection to Supergirl. Meanwhile, Samantha feels like she's letting Ruby down, and J'onn confesses an old secret.

The episode was rated 7.71 from 2693 votes.

Supergirl - S3E7

#5 - Wake Up (Season 3 - Episode 7)

When Winn and the team discover an alien ship has crash landed deep underwater beneath National City, Kara/Supergirl is called in to investigate. Meanwhile, Hank attempts to bond with his father, Myr'nn. Samantha, eager for some understanding of the changes she has been experiencing, looks to her estranged mother, Patricia Arias, for answers.

The episode was rated 7.72 from 2460 votes.

Supergirl - S3E1

#4 - Girl of Steel (Season 3 - Episode 1)


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.

The episode was rated 7.74 from 3358 votes.

Supergirl - S3E23

#3 - Battles Lost And Won (Season 3 - Episode 23)

Supergirl and team take on Selena in an epic battle for Earth.

The episode was rated 7.76 from 1735 votes.

Supergirl - S3E9

#2 - Reign (Season 3 - Episode 9)


Supergirl investigates a mysterious symbol popping up all over National City, tracing its origins back to an ancient prophecy and the mark of the World Killer, Reign. Meanwhile, the tension between Lena and Morgan Edge continues to build, causing James to step in and offer up some protection, and possibly igniting a spark in the process.

The episode was rated 7.97 from 2389 votes.

Supergirl - S3E8

#1 - Crisis on Earth-X (I) (Season 3 - Episode 8)

Barry and Iris’s wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Earth’s mightiest heroes – Green Arrow, Supergirl, The Flash and White Canary – lead their teams into battle to save the world. The crossover continues on Arrow S06E08 Crisis on Earth-X (II), The Flash S04E08 Crisis on Earth-X (III) and DC's Legends of Tomorrow S03E08 Crisis on Earth-X (IV).

The episode was rated 8.05 from 3415 votes.

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