The battle concludes in the three-part Crossover.

Elseworlds, Part 3

Drama

In the final part of the three-part crossover, Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives.

Supergirl

Meet Superman's fierce, high-flying cousin... 

Meet Superman's fierce, high-flying cousin - turns out saving the world is a family thing! Catch every series of this all-action DC adventure.

supergirl

A new hero takes to the skies in the series premiere.

Pilot

In the series premiere episode, Superman's cousin, Kara Zor-El - after 12 years of keeping her powers a secret on Earth - decides to finally embrace her superhuman abilities and become the hero she was always meant to be.

A new threat forces Kara to push her doubts aside.

Stronger Together

When Kara's attempts to help National City don't go according to plan, she must put aside the doubts that she - and the city's media - has about her abilities in order to capture an escapee from the Kryptonian prison, Fort Rozz.

Supergirl must face down Reactron, one of Superman's enemies.

Fight or Flight

Supergirl's powers are tested when Reactron, one of Superman's formidable enemies, arrives in National City and targets the young hero. Also, Cat plans to run an expose on Supergirl.

Kara's Thanksgiving is interrupted by Livewire.

Livewire

Kara's Thanksgiving may be ruined when she suspects her foster mother, Dr. Eliza Danvers, who is coming to town, disapproves of her new role as a super hero.

Kara babysits for Cat while Supergirl saves the city.

How Does She Do It?

Kara's two identities are stretched thin when Supergirl must protect National City from a series of bombings and Kara is tasked with babysitting Cat's son, Carter.

Kara goes too far when facing the cyborg Red Tornado.

Red Faced

Personal and professional stress get the better of Kara when she goes too far during a training exercise against Red Tornado, a military cyborg commissioned by Lucy Lane's father, General Sam Lane.

Kara loses her powers and an earthquake strikes the city.

Human for a Day

Kara and her friends must rely on their inner strength and courage when an earthquake strikes National City. Also, Alex's mistrust of Hank reaches a breaking point when the earthquake traps them in the DEO with Jemm, a powerful alien escapee.

Kara goes head-to-head with her aunt Astra.

Hostile Takeover

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.

Kara must find a way to rescue Hank from Astra's husband.

Blood Bonds

With Astra in captivity at the DEO, her husband, Non, captures Hank, leading to a tense standoff between the two sides. Also, Kara continues to refute Cat's allegations that she is Supergirl.

Winn's dad, the supervillain Toyman, escapes from prison.

Childish Things

Kara does her best to support Winn when his father, the supervillain Toyman, breaks out of prison and seeks out his son for unknown reasons.

Kara helps Hank battle an alien who killed his people.

Strange Visitor from Another Planet

Kara must help Hank face his painful past when a White Martian - a member of the alien race that wiped out his people - kidnaps Senator Miranda Crane, an anti-alien politician. Also, Cat's estranged son, Adam, arrives in National City.

Kara faces off against the Bizarro version of herself.

Bizarro

Kara faces off against her mirror image when Bizarro, a twisted version of Supergirl, sets out to destroy her. Also, Kara grows closer with Cat's son, Adam.

Kara is trapped in a dream world by an alien parasite.

For the Girl Who Has Everything

Kara's friends must find a way to save her life when a parasitic alien attaches itself to her and traps her in a dream world where her family is alive and her home planet was never destroyed.

Supergirl battles the deadly Master Jailer.

Truth, Justice and the American Way

Supergirl does battle with the deadly Master Jailer, who is hunting and executing escaped Fort Rozz prisoners. Also, Cat hires a second assistant, Siobhan Smythe, who immediately tries to one-up Kara.

Solitude

While James's relationship with Lucy reaches a crossroad, Kara travels to Superman's Fortress of Solitude in hopes of learning how to defeat Indigo, a dangerous being with a connection to Kara's past, who can transport via the Internet.

Red Kryptonite causes Supergirl to turn on her friends.

Falling

After being exposed to Red Kryptonite, making her malicious and dangerous, Kara turns on her friends and the citizens of National City. Also, Cat appears on The Talk to discuss Supergirl.

J'onn J'onzz reveals the story of his hidden identity.

Manhunter

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, while Siobhan plots against Kara.

Worlds Finest

Supergirl gains a new ally when the lightning-fast super hero The Flash suddenly crosses over from an alternate universe and offers to help Kara battle Silver Banshee and Livewire in exchange for her help in finding a way to return him home.

Non and Indigo use mind control on National City.

Myriad

Kara must find a way to free her friends when Non and Indigo use mind control to turn National City's citizens into their own army.

Supergirl must save the planet in the first season finale.

Better Angels

In the first season finale, Supergirl faces her greatest test yet when Non and Indigo plan to destroy every person on the planet - forcing Kara to do battle with an unexpected foe and risk everything...including her life.

Superman helps out in the season premiere.

The Adventures of Supergirl

In the season two premiere, a new threat emerges in National City, and Kara teams up with her cousin, Superman to stop it. Although Kara is thrilled to have family in town, it leaves Alex feeling a bit left out.

The Last Children of Krypton

Kara's first day at her new job doesn't go as she planned after she meets her new boss, Snapper Carr.

Supergirl and the DEO are assigned to protect the President.

Welcome to Earth

When 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.

Supergirl encounters an alien fight club.

Survivors

When Kara and Alex investigate the murder of an unregistered alien, the trail leads to an alien fight club run by Roulette, the ringmaster who commands aliens to fight in mortal combat for the entertainment of rich humans.

Supergirl takes on a ruthless new gang from Cadmus.

Crossfire

Supergirl takes on a ruthless new gang who has been armed with dangerous new alien technology. When Cadmus sends a video to the DEO, the team realizes Cadmus is the one staffing the criminals for a secret mission.

Changing

The Guardian debuts to lend a hand after a parasite alien drains Supergirl of her power. Mon-El considers a less than desirable new career which then leads him to contemplate his motives. Alex struggles with a new reality.

Supergirl faces off against Cyborg Superman.

The Darkest Place

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.

Medusa

The epic DC Super Hero Crossover Event kicks off when Barry Allen and Cisco Ramon seek Kara's help with an alien invasion on their Earth.

Kara is moved by the story of a missing woman named Izzy and decides to investigate.

Supergirl Lives

Kara is moved by the story of a missing woman named Izzy and decides to investigate. Kara takes Mon-El with her to the last place Izzy was seen and they find themselves thrust through a portal to another planet.

Livewire is set loose upon National City.

We Can Be Heroes

After Livewire seemingly breaks out of prison, Supergirl is intent on recapturing her. She takes Mon-El with her when she sees Livewire attack the NCPD, but things go awry when he puts Supergirl before the citizens of National City.

The Martian Chronicles

Armek, a White Martian, descends on National City intent on taking M'gann back to Mars to face her punishment as a traitor. Hank and Supergirl determine the best way to keep M'gann safe is to bring her to the DEO.

Luthors

After Metallo breaks out of prison and frees Lillian Luthor, the police blame Lena for his escape and arrest her. Despite overwhelming evidence, Kara refuses to believe her friend is guilty and fights to clear Lena's name.

When Mr. Mxyzptlk, a magical imp, shows up on Earth and declares his love for Kara.

Mr. & Mrs. Mxyzptlk

When Mr. Mxyzptlk, a magical imp, shows up on Earth and declares his love for Kara, she tries to let him down easy, thinking him harmless. However, he decides it's a challenge and starts to wreak havoc on National City.

Homecoming

When Jeremiah Danvers is rescued from Cadmus, Alex and Kara are thrilled to have their father back. The Danvers arrange a family dinner to celebrate, but things go awry when a suspicious Mon-El starts to question Jeremiah about his sudden return.

Kara sets up an interview between Snapper Carr and Supergirl.

Exodus

As Alex searches for Jeremiah, and Kara investigates a series of alien kidnappings, the sisters realize they must break the rules in order to foil a new Cadmus plot.

A new villain comes to National City, putting Supergirl on high alert.

Star-Crossed

A new villain comes to National City, putting Supergirl on high alert. Meanwhile, Winn's girlfriend, Lyra, gets Winn in trouble with the law. Maggie attempts to help Winn but old loyalties get in the way. The Music Meister attacks Supergirl.

Distant Sun

When a large bounty is put out on Supergirl, aliens from near and far attack National City intent on taking out the Woman of Steel.

Lena's ex-boyfriend comes to National City to unveil his big breakthrough.

Ace Reporter

Lena's ex-boyfriend, Jack Spheer, comes to National City to unveil his big breakthrough in nano-technology, which has the potential to eradicate all diseases.

Supergirl and Maggie must work together to save Alex.

Alex

When Alex is abducted, the kidnapper threatens to kill her unless Supergirl releases a notorious criminal from prison.

It's up to Guardian to stop alien attacks on the city.

City of Lost Children

When an alien attacks National City, Supergirl and the DEO learn the alien is a Phorian, an otherwise peaceful race with telekinetic powers.

Resist

Cat Grant returns to National City. Meanwhile, Supergirl grapples with whether or not to obey orders from the President regarding Rhea's latest actions.

Supergirl challenges Rhea in the season two finale.

Nevertheless, She Persisted

In the second season finale, Supergirl challenges Rhea in battle to save National City. Meanwhile, Cat Grant offers Supergirl some sage advice and Superman returns.

Kara focuses on being Supergirl in the season premiere.

Girl of Steel

In the season three premiere, Kara deals with the loss of Mon-El by focusing all her energy on being Supergirl and the mysterious new threat against National City.

Psi, a thief with psychic powers, attacks National City.

Triggers

Psi, a thief with psychic powers, attacks National City. Able to immobilise people by tapping into their worst fears, Psi proves a formidable opponent for Supergirl.

Eliza throws a wedding shower for Alex and Maggie.

Far from the Tree

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

The Faithful

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

Damage

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.

Kara and Alex escape down memory lane to Midvale.

Midvale

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 Danvers sisters closer together.

Winn and the team discover an alien ship has crash landed deep underwater.

Wake Up

When Winn and the team discover an alien ship has crash landed deep underwater beneath National City, Supergirl is called in to investigate.

Crisis on Earth-X, Part 1

The epic four-way crossover with Arrow, Supergirl, The Flash and DC's Legends of Tomorrow begins. Barry Allen and Iris West's wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony.

Reign challenges Supergirl in the winter finale.

Reign

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.

The DEO teams up with the Legion of Super Heroes.

Legion of Super-Heroes

Reign continues her rampage on the city, so the DEO teams up with the Legion of Super Heroes to try to stop her.

Supergirl teams up with Saturn Girl, Livewire and Psi.

Fort Rozz

As Reign continues to terrorise the city, Supergirl teams up with Saturn Girl, and the two recruit Supergirl's former enemies, Livewire and Psi.

For Good

Someone tries to kill Morgan Edge and he barely survives. He accuses Lena of being behind the attempt and vows to destroy her. When Lena fears her hatred for Morgan will take her to the Luthor dark side, Kara steps in to help her friend.

Both Sides Now

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.

When Winn's father dies, his estranged mother, Mary, reappears trying to reconnect.

Schott Through the Heart

When Winn's father dies, his estranged mother, Mary, reappears trying to reconnect and to explain why she abandoned him all those years ago.

J'onn has to face the truth about his father.

In Search of Lost Time

When Myr'nn inadvertently causes psychic disturbances at the DEO, Supergirl must work with J'onn to contain the resulting chaos. Meanwhile, Mon-El begins training Kara in fighting techniques he's learned in the future for battling Worldkillers.

Supergirl and Imra team up against the Third Worldkiller.

Of Two Minds

Supergirl and Imra have different ideas on how to stop the third Worldkiller, Pestilence. However, when both Alex and Winn are seriously injured by Pestilence, Supergirl and Imra team up to stop the destruction.

Supergirl takes on all three Worldkillers.

Trinity

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.

When Reign starts hunting Ruby, Supergirl and Alex work together to keep her safe.

Shelter from the Storm

When Reign starts hunting Ruby, Supergirl and Alex work together to keep her safe. Supergirl and J'onn look to Sam's mother, Patricia for advice on how to stop Reign and come away with some shocking news.

The Fanatical

Someone learns Guardian's identity and threatens to expose James if he doesn't do what they ask. James contemplates what it means to be a black vigilante without a mask in America.

Supergirl learns a stunning secret about Krypton.

Dark Side of the Moon

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.

Not Kansas

While J'onn finds out that special DEO-caliber weapons have hit the streets of National City, Kara considers a major life decision.

Supergirl must stop Serena before she gets to Earth.

Make It Reign

Supergirl learns the true depth of Selena's nefarious plan for Earth. While J'onn prepares to say goodbye to his father, Supergirl, Mon-El and Alura must devise a plan to stop Selena before she gets to Earth.

Supergirl takes on Selena in the season three finale.

Battles Lost and Won

In the shocking third season finale, Supergirl and the team take on Selena in an epic battle for Earth.

Cadmus sows fear in the season four premiere.

The American Alien

Diving back into reporting, Kara welcomes new reporter Nia Nal to CatCo in the season four premiere.

Supergirl sets out to capture Mercy Graves.

Fallout

A shocking revelation causes chaos in National City. While Alex takes control at the DEO, Supergirl sets out to capture Mercy Graves.

Xander Berkeley guests in the origin story of Agent Liberty.

Man of Steel

Ben Lockwood didn't always hate aliens. Through a series of incidents, and input from his anti-alien father, Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty to today.

Ahimsa

Parasite Lost

Colonel Haley makes a surprising decision regarding Supergirl. Meanwhile, Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them.

Kara's feeling down after her debate with Ben Lockwood.

Call to Action

Although everyone gathers for Thanksgiving, Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien sentiment coursing through National City.