airs 2018-04-24 (in 2 days ) In Search of Lost Time Season: 3 | Episode: 15
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.
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Show Summary
Born on the planet Krypton, Kara Zor-El escaped amid its destruction years ago with her famous cousin. Now at the age 24, she finally embraces her superhuman abilities to be the hero she was always meant to be.
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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.
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.
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.
After Winslow dies, his wife Mary comes to National City to attempt to reunite with Winn. However, a new murderous toymaker threatens Winn and Mary, Meanwhile, M'yrnn asks Alex to keep a secret from Hank, and Mon-El tries to find the right time to tell Supergirl something important about one of the Worldkillers.
The DEO easily captures Julia Freeman, the second Worldkiller Purity's body. While Supergirl and Alex try to get through to her, Mon-El asks Hank for his help repairing the Legion Cruiser.
Morgan believes that a recent attempt on his life was made by Lena. When Lena is poisoned, Kara steps in to find out who is responsible for the escalation in hosility. Meanwhile, Sam turns to Alex for help determining the cause of her blackouts.
Supergirl and Saturn Girl are forced to recruit two female metas to find a prisoner on Fort Rozz, which is orbiting a sun that emits radiation fatal to males. Meanwhile, Alex babysits Ruby while Sam goes on a work trip.
Mon-El and Imra decide whether to help the DEO battle Reign. Meanwhile, another Legionnaire attempts to help Kara emerge from the coma that Reign put her into after their battle.
Supergirl learns that a mysterious Kryptonian symbol suddenly appearing around the city heralds the appearance of the World Killer, Reign. She's a Kryptonian whose powers exceed Supergirl's... and who is determined to bring judgment to a sinful world. The tension between Lena and Morgan Edge continues to build.
Rather than wallow in self-pity, Kara and Alex go to Barry Allen and Iris West's wedding... only to find the ceremony interrupted by Nazi soldiers and villains from Earth-X including a mysteriously strong superpowered female warrior.
The DEO rescues Mon-El from a spaceship buried in 12,000 years of rock, but Mon-El remains strangely silent about how he got there. Meanwhile, Hank takes M'yrnn to the park, and Sam goes to her mother Patricia for answers about her birth.
Kara takes Alex home to Midvale after Alex and Maggie break up. While Alex deals with the end of her relationship, she and Kara remember the first time that they bonded as sisters while solving the murder of a fellow high school student.
Morgan accuses Lena of poisoning the children of National City with the lead bomb she used to drive off the Daxamites. Kara and Sam work to clear their friend's name. Meanwhile, Maggie and Alex break up.
Kara learns of a cult-like organization of people that she's rescued... who consider her a god. Meanwhile, Sam has difficulty balancing her career with her personal life.
Supergirl goes with Hank to Mars in response to M'gann's telepathic request for help. Meanwhile, Maggie invites her estranged father Oscar to her and Alex's wedding shower that's sponsored by Eliza.
Supergirl faces Psi, a thief who can psychically induce her victims' worst fears. Meanwhile, James deals with having a new boss at CatCo, and Alex and Maggie continue making plans for their wedding.
After losing Mon-El, Kara decides to give up her human life and dedicate herself full-time to being Supergirl. Meanwhile, a new menace threatens National City, and real estate mogul Morgan Edge makes a bid to buy up CatCo. Also, Alex confesses a secret to Maggie, a citizen of National City has a mysterious connection to Kara, and Lena makes a bold move.
Lillian comes up with the ultimate weapon to drive the Daxamites off of Earth, but Supergirl is reluctant to make the sacrifice necessary. Instead, she challenges Rhea to a ritual trial by combat to save National City and Earth. Superman returns. Cat Grant offers Supergirl some sage advice.
Alex takes over as Acting Director of the DEO as the Daxamites take over National City, open fire on Air Force One, and recruit a familiar face to their side. Meanwhile, Cat Grant returns to National City to inspire Supergirl and the populace.
Alien refugees, the Phorians, trigger telekinetic quakes every time that Lena and Rhea activate the portal. While James tries to get through to one alien boy who knows where the others are, the DEO tries to find the portal before it's too late for National City.
A man abducts Alex and threatens to kill her unless Kara helps a supermax prisoner escape... and the abductor knows that Kara is Supergirl. Meanwhile, Rhea approaches Lena with an offer.
Lena's ex, Jack Spheer, arrives in National City to roll out a new nanite medical procedure. However, Kara soon realizes that something more is going on when one of the human test subjects die under mysterious circumstances. Meanwhile, Lyra comes between Winn and James in their crimefighting efforts.
Someone hires bounty hunters to kill Supergirl, and Mon-El believes that his parents are responsible. Meanwhile, Maggie and Alex run into Maggie's old girlfriend, and President Marsdin gives express orders to Hank not to attack the Daxamites.
Mon-El's parents arrive to bring home and help restore Daxam to its former glory... and Supergirl realizes that Mon-El has been lying to her. Meanwhile, Winn discovers that Lyra has set him up when he's the prime suspect in a museum robbery. The Music Meister puts Supergirl into a coma and the story line concludes in The Flash: 'Duet', Season 3, Episode 17.
Alex refuses to obey Hank's orders to stand down and sets out to find Cadmus and protect Jeremiah. Meanwhile, Kara takes drastic steps when Snapper refuses to publish her story intended to protect the remaining aliens on Earth from Cadmus.
The DEO manages to rescue Jeremiah from Cadmus, but Mon-El's suspicions soon drive a wedge between him and the Danvers sisters. Meanwhile, Cadmus continues with its master plan to cleanse the planet of alien influence.
It's Valentine's Day, and Kara finds herself dealing with the amorous advances of Mxyztplk, a fifth-dimensional being with unlimited magical powers. Meanwhile, Alex discovers that Maggie hates Valentine's Day, while an alien woman hits on Winn.
Metallo breaks Lillian out of jail and the evidence shows that Lena was responsible. Kara is the only one who believes that Lena is innocent, and sets out to prove it.
M'gann's White Martian mate Armek comes to Earth to bring her back to face justice for her 'treachery' When she takes refuge in the DEO, Armek infiltrates the building and uses his shapeshifting powers to spread confusion.
Livewire escapes prison, but the DEO soon realizes that she wasn't a willing escapee. Meanwhile, Megan collapses and Hank refuses to mind-meld with her to find out what is wrong with her, and James considers telling Kara that he's Guardian.
When a girl disappears, Kara discovers a pattern of missing people and goes looking with Mon-El... and they both end up on an alien planet under a red sun which renders them powerless. Meanwhile, Winn has a brush with death, and Alex and Maggie have their first disagreement.
When the Danvers celebrate Thanksgiving, Alex tries to find the right time to tell her mother Eliza that she's gay. Meanwhile, Lena is forced to choose when Supergirl tells her that Lillian plans to unleash a virus that will wipe out every alien in the city.
Crossover among four CW shows: Supergirl 'Medusa'; The Flash 'Invasion!'; Arrow ‘Invasion!'; DC's Legends of Tomorrow 'Invasion!'
While Cadmus captures Supegirl and Mon-El, Guardian and Winn go after a murderous vigilante that is letting Guardian take the blame for his murders. Meanwhile, Alex and Maggie have issues.
Supergirl battles a scientist who has been possessed by an alien parasite, giving the ability to drain the lifeforce from anyone he touches. Meanwhile, Alex comes out to Kara, and the Guardian makes his first public appearance.
Cadmus provides a gang of crooks with alien weaponry in an attempt to spread fear and panic among the populace. Meanwhile, Kara tries to mentor Mon-El with minimal success, and James decides that he wants to be a superhero.
While Hank tries to bond with Megan, Supergirl and Alex discover that a woman named Roulette is running an underground fight club using aliens as gladiators. Meanwhile, Mon-El convinces Winn to take him out for a night on the town.
Supergirl and the DEO are called on to protect the President when she comes to National City to sign her Alien Amnesty Act. However, a hostile alien threatens to kill the President and anyone who gets in its way. Meanwhile, Alex meets Maggie Sawyer, a detective with the NCPD's science division, and Snapper challenges James' authority.
Cadmus creates a second Metallo and declares war on any aliens on Earth. Meanwhile, Kara finds her new boss less than sympathetic, and Cat gives her surprising news.
After a seemingly Kryptonian pod crashes in National City, Superman comes to visit his cousin. While the two of them try to determine if Lena Luthor--Lex's sister--is up to no good, Kara wrestles with her personal life.
To stop Non from wiping out Earth's population, Supergirl has no choice but to sacrifice her life. Before she does so, Kara says goodbye as best she can to her friends without telling them the truth and inciting a panic.
Supergirl finds herself in a super team-up when a new superhero, The Flash, accidentally crosses dimensions and finds himself in Kara's universe. Together they have to battle Livewire and a new villainess, Silver Banshee.
A captive Hank tells the U.S government how he came to lead the DEO, but receives a less than sympathetic ear. Meanwhile, Kara reveals her identity to someone close to the investigation, and Siobhan plans revenge Kara for getting her fired from CatCo.
After defending Supergirl to the public, Cat is forced to issue a public warning after exposure to Red Kryptonite turns Supergirl into a power-mad villain.
A new enemy emerges to threaten Supergirl and National City... and has a connection to Krypton. Meanwhile, Lucy demands the truth from James, and Kara continues refusing to work with Hank, unaware that Alex is the one who killed Astra.
An armored alien with advanced tech is hunting down the Fort Rozz prisoners... and executing them. While Supergirl tries to find him, James questions whether the DEO has the right to lock up Max without charges or a trial. Meanwhile, Kara tries to deal with Cat's new assistant at work, who is intent on upstaging Kara.
Supergirl is ensnared by an alien plant that forces her into her deepest desire, and her friends and sister must free her before it's too late. Meanwhile, the Kryptonians launch their plan to bring humanity to its knees and save Earth.
Max creates a reverse image of Supergirl using her DNA, and sets it to fight the Woman of Steel. Meanwhile, James and Winn share a drink, and Max reveals to Alex how much he knows about her connection to Supergirl.
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.
The Toyman--Winn's father--breaks out of prison and begins a new criminal rampage on a quest to be reunited with his son. Meanwhile, Lucy accepts a job at CatCo, much to Jimmy's discomfort.
Supergirl tries to convince her aunt to help them recover Hank from the Kryptonians and is forced to rely on blind faith. Meanwhile, Max continues his campaign to bring down Supergirl, and Kara tries to convince Cat that she and Supergirl are not one and the same.
Astra calls Supergirl out to fight, but soon loses. However, Hank and Alex suspect that the Kryptonian general lost too easily. Meanwhile, an email hack threatens Cat's position as CEO of CatCo, and Kara learns that someone is trying to force her boss out of the company.
Kara is still without her powers when an earthquake rocks National City. Now she and her friends must rise to the occasion. Meanwhile, the DEO's attempts to restrain an escaped prisoner are threatened by Alex's mistrust of Hank after she learns of his role in Jeremiah's death.
While Kara deals with personal pressures as both office assistant and superhero, General Sam Lane arrives in National City to field-test his new anti-insurgent android, Red Tornado... and to tell James that he's not good enough for his daughter Lucy. Meanwhile, Alex and Kara ask Winn to hack the DEO mainframe to find out how Jeremiah died, and Cat deals with her domineering mother.
Kara finds herself juggling her personal and public lives when she offers to take care of Cat's son Carter, deal with James' relationship with Lucy, and try to stop a bomber who is targeting Maxtech properties.
Supergirl faces her first non-alien nemesis when one of her cousin's enemies--the nuclear-powered Reactron--comes looking to kill her. Meanwhile, Cat runs a derogatory exposé on Supergirl after interviewing the superhero.
A new Fort Rozz prisoner, Hellgrammite, commits a series of robberies of chemical manufacturing plants. While the DEO goes after him, Supergirl discovers that fame is fickle when the public turns against her after a series of mishaps.
Twenty-four-year-old Kara Zor-El, cousin of Superman, who was taken in by the Danvers family when she was 12 after being sent away from Krypton, must learn to embrace her powers after previously hiding them.