The BEST Episodes of Supergirl
Every episode ever - ranked by fan votes!
Last Updated: Sep 21, 2021
Network: The CW
As Superman’s cousin, Kara Danvers, also known as Supergirl, balances her work as a reporter for CatCo Worldwide Media with her work for the Department of Extra-Normal Operations, a super-secret government organization whose mission is to keep National City – and the Earth – safe from sinister threats.
#1 - Worlds Finest
Season 1 - Episode 18 - Aired Mar 28, 2016
Kara gains a new ally when the lightning-fast superhero The Flash suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire in exchange for her help in finding a way to return him home.
#2 - Crisis on Earth-X (1)
Season 3 - Episode 8 - Aired Nov 27, 2017
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.
#3 - Crisis on Infinite Earths (1)
Season 5 - Episode 9 - Aired Dec 8, 2019
The Monitor sends Harbinger to gather the worlds’ greatest heroes—Supergirl, The Flash, Green Arrow, Batwoman, White Canary, The Atom and Superman—in preparation for the impending Crisis. With their worlds in imminent danger, the superheroes suit up for battle. J’onn and Alex recruit Lena to help them find a way to save the people of Earth-38. Part 1 - Supergirl - S05E09 "Crisis on Infinite Earths: Part 1" Part 2 - Batwoman - S01E09 "Crisis on Infinite Earths: Part 2" Part 3 - The Flash - S06E09 "Crisis on Infinite Earths: Part 3" Part 4 - Arrow - S08E08 "Crisis on Infinite Earths: Part 4" Part 5 - DC's Legends of Tomorrow - S05E01 "Crisis on Infinite Earths: Part 5"
#4 - Reign
Season 3 - Episode 9 - Aired Dec 4, 2017
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.
#5 - Nevertheless, She Persisted
Season 2 - Episode 22 - Aired May 22, 2017
Supergirl challenges Rhea to battle to save National City. Meanwhile, Superman returns and Cat Grant offers Supergirl some sage advice.
#6 - Elseworlds (3)
Season 4 - Episode 9 - Aired Dec 11, 2018
Supergirl, The Flash, Green Arrow and Superman face the battle of their lives. Part 1 - The Flash - S05E09 "Elseworlds, Part 1" Part 2 - Arrow - S07E09 "Elseworlds, Part 2" Part 3 - Supergirl - S04E09 "Elseworlds, Part 3"
#7 - Falling
Season 1 - Episode 16 - Aired Mar 14, 2016
Kara turns on her friends and the citizens of National City after being exposed to Red Kryptonite makes her malicious and dangerous. Also, Cat appears on THE TALK to discuss Supergirl.
#8 - Better Angels
Season 1 - Episode 20 - Aired Apr 18, 2016
Supergirl is forced to do battle with an unexpected foe and must risk everything – including her life – to prevent Non and Indigo from destroying every person on the planet.
#9 - The Last Children of Krypton
Season 2 - Episode 2 - Aired Oct 17, 2016
CADMUS attacks National City with a Kryptonite-powered villain who ends up seriously hurting Supergirl. Superman blames Hank because the Kryptonite was stolen from the DEO. Meanwhile, Kara’s first day at her new job doesn’t go as planned after she meets her new boss, Snapper Carr.
#10 - Welcome to Earth
Season 2 - Episode 3 - Aired Oct 24, 2016
An attack is made on the President as hot-button, alien vs. human rights issues heat up in National City. Supergirl and the DEO are assigned to protect the President and bring in the responsible party. Alex teams up with Detective Maggie Sawyer to investigate the case while Kara searches for a recently escaped Mon-El, who she fears may be the alien behind the assault.
#11 - Resist
Season 2 - Episode 21 - Aired May 15, 2017
The Daxamites launch a full invasion of National City, killing and arresting civilians. They also attack the DEO, but Alex and Winn manage to escape. Mon-El learns that he has to marry Lena in order to unite the people of Earth with Daxam.
#12 - The Adventures of Supergirl
Season 2 - Episode 1 - Aired Oct 10, 2016
When a new threat emerges in National City, Kara/Supergirl teams up with her cousin, Clark Kent/Superman, to stop it. Kara is thrilled to have family in town but it leaves Alex feeling a bit left out. Meanwhile, Hank and Supergirl are stunned by the pod that came crashing to Earth.
#13 - Hostile Takeover
Season 1 - Episode 8 - Aired Dec 14, 2015
Kara goes toe-to-toe with Astra when her aunt challenges Kara’s beliefs about her mother. Also, Cat is threatened with being removed as the CEO of CatCo after a hacker exposes her private and damaging emails.
#14 - The Quest for Peace
Season 4 - Episode 22 - Aired May 19, 2019
Lex Luthor descends upon Washington, D.C. and summons Lena and Lillian Luthor to the White House. Supergirl realizes she has one last chance to stop Lex and turns to the power of the press to help her.
#15 - Manhunter
Season 1 - Episode 17 - Aired Mar 21, 2016
J’onn J’onzz reveals the details of meeting Kara and Alex’s father, Dr. Jeremiah Danvers, and assuming Hank Henshaw’s identity. Also, Kara debates trusting someone new with her secret identity and Siobhan plots against Kara.
#16 - Battles Lost and Won
Season 3 - Episode 23 - Aired Jun 18, 2018
Supergirl and team take on Serena in an epic battle for Earth.
#17 - O Brother, Where Art Thou?
Season 4 - Episode 15 - Aired Mar 17, 2019
Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, Lena is suspicious of Lex's motives but when she’s faced with a life and death situation, she must decide how she truly feels about her brother. Meanwhile, Supergirl and J'onn face off against Manchester Black. James' sister Kelly comes to town.
#18 - Bunker Hill
Season 4 - Episode 8 - Aired Dec 2, 2018
Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream, Kara and Brainy try to persuade Nia to embrace her destiny, and Manchester Black pays Ben Lockwood a menacing visit.
#19 - The House of L
Season 4 - Episode 16 - Aired Mar 24, 2019
In the wake of Lex Luthor's return, the show flashes back to what he's been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena.
#20 - Medusa (1)
Season 2 - Episode 8 - Aired Nov 28, 2016
Eliza comes to town to celebrate Thanksgiving with her daughters. Alex decides it’s time to come out to her mother; Kara is shocked when Eliza suggests Mon-El has feelings for her, and Winn and James consider telling Kara the truth about the Guardian. Meanwhile, CADMUS unleashes a virus that instantly kills any alien in the vicinity so Kara enlists an unexpected ally – Lena Luthor. Barry Allen and Cisco Ramon seek Kara’s help with an alien invasion on their Earth. Part 1 - Supergirl - S02E08 "Medusa" Part 2 - The Flash - S03E08 "Invasion!" Part 3 - Arrow - S05E08 "Invasion!" Part 4 - DC's Legends of Tomorrow - S02E07 "Invasion!"
#21 - Alex
Season 2 - Episode 19 - Aired May 1, 2017
Alex is kidnapped and the kidnapper threatens to kill her unless Supergirl releases a notorious criminal from prison. Supergirl and Maggie have always had different approaches to apprehending criminals but this time they must work together to save Alex. Meanwhile, Rhea has an interesting proposal for Lena.
#22 - The Darkest Place
Season 2 - Episode 7 - Aired Nov 21, 2016
While Guardian tries to clear his name after being accused of a murder committed by another vigilante, Supergirl heads out on a solo mission to rescue Mon-El who has been captured by CADMUS. While fighting to free Mon-El, Supergirl comes face to face with Cyborg Superman.
#23 - All About Eve
Season 4 - Episode 17 - Aired Mar 31, 2019
Supergirl must deal with the destructive aftermath of Lex's nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet.
#24 - Red Dawn
Season 4 - Episode 21 - Aired May 12, 2019
Kara comes face to face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena turns to an unlikely source for help – Lillian Luthor. Meanwhile, Alex realizes she’s missing parts of her memory, and Brainy, Nia and J’onn set out to track down aliens who have been abducted by Lex.
#25 - City of Lost Children
Season 2 - Episode 20 - Aired May 8, 2017
The DEO investigates a Phorian woman who uses her telekinetic powers to cause rampage. James tracks down her son, Marcus, who refuses to speak with anyone but James, who spends time bonding with him. With Rhea's encouragement, Lena completes the matter transporter, which Rhea activates, causing Marcus to nearly destroy the office with his powers.