The Adventures Of Supergirl 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.
The Last Children Of Krypton 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.
Welcome To Earth 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.
Survivors Thrilled to have found another Martian, Hank is determined to get to know M'Gann better; Kara and Alex take notice of an alien fight club run by Roulette while investigating an unregistered alien's murder; and Supergirl starts training Mon-El, whom she has taken under her wing.
Crossfire Supergirl faces a new challenge from a ruthless gang who are armed and dangerous with cutting-edge alien technology; at the same time, Kara gets Mon-El an internship at CatCo; James comes to an important decision; and Lena puts Kara's name on the guest list for one of her fund-raisers.
Changing The Guardian makes his debut in National City to lend a hand after a parasite alien drains Supergirl of her power; at the same time, Mon-El considers a less-than-desirable career change; and Alex struggles with a new reality.
The Darkest Place Guardian must clear his name after being accused of a murder committed by another vigilante; at the same time, Supergirl comes face to face with Cyborg Superman while on a solo mission to rescue Mon-El, who has been captured by Cadmus.
Medusa A superhero crossover event begins with Barry Allen and Cisco Ramon from "The Flash" seeking Kara's help with an alien invasion; at the same time, Eliza comes to town to celebrate Thanksgiving with her daughters, which seems like the perfect opportunity for Alex to come out to her mother. Meanwhile, Winn and James consider telling Kara the truth about the Guardian; and Kara wants to team up with Lena Luthor to combat a deadly virus unleashed by CADMUS.
Supergirl Lives The story of a missing woman named Izzy moves Kara to investigate, even though Snapper Carr has told her to leave the matter alone. When Kara and Mon-El check out the last place Izzy was seen, they end up thrust through a portal to another planet, where the downtrodden are sold as slaves as part of a trafficking ring run by Roulette. Meanwhile, Alex blames herself - and her new relationship with Maggie - for her sister's disappearance.
We Can Be Heroes Supergirl sets out to recapture Livewire, who has seemingly escaped from prison, but her efforts hit a road block when Mon-El puts Supergirl's safety before the citizens of National City. Meanwhile, James decides to be truthful with Kara; and M'Gann falls into a coma following a psychic attack.
The Martian Chronicles Armek arrives in National City intent on taking M'gann back to Mars to face her punishment as a traitor. Thinking she'll be safe at the DEO, Hank and Supergirl are in for a startling surprise when shapeshifter Armek is in the building and under disguise.
Luthors Lena is arrested for helping break Metallo and Lillian Luthor out of prison. While the evidence seems stacked against her, Kara refuses to believe her friend is guilty and fights to clear Lena's name. Meanwhile, Alex and Maggie celebrate Valentine's Day.
Mr. & Mrs. Mxyzptlkl A magical imp named Mr. Mxyzptlk shows up on Earth and declares his love for Kara, who tries to let him down easy. However, he won't take no for an answer and starts to wreak havoc on National City. As Mon-El and Kara argue over how to get rid of Mr. Mxyzptlk, Alex and Maggie celebrate their first Valentine's Day together.
Homecoming Alex and Kara are thrilled to have their father, Jeremiah Danvers, back after he's rescued from Cadmus. 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.
Exodus As Alex searches for Jeremiah and Kara investigates a series of alien kidnappings, the sisters realize they must break the rules to foil a new Cadmus plot. In an effort to get Snapper Carr to run a story that would help her stop Cadmus, Kara agrees to set up an interview between Snapper and Supergirl.
Star-Crossed A new villain comes to National City, putting Supergirl on high alert; at the same time, she faces an attack by the Music Meister. Meanwhile, Winn's girlfriend, Lyra, gets Winn in trouble with the law; and Maggie attempts to help Winn, but old loyalties get in the way.
Distant Sun A large bounty is put out on Supergirl and aliens from far and near attack National City intent on taking out the woman of steel; Alex and Maggie run into Maggie's ex-girlfriend, Emily, who is in town for a week; Hank gets an interesting order from President Marsdin.
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. Lena asks Kara to attend Jack's conference with her for support. When Kara sees Snapper in attendance she's inspired to tap back into her reporter skills and questions Jack on his discovery, which ultimately leads to a bigger investigation that puts everyone in danger.
Alex 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.
City Of Lost Childrenn When an alien attacks National City, Supergirl and the DEO learn the alien is a Phorian, an otherwise peaceful race with telekinetic powers. Guardian gets a lead on the Phorian's address, but instead of finding the culprit, he finds a very scared boy named Marcus. Marcus will only trust James, so it is up to Guardian to stop the attacks on the city. Meanwhile, Rhea's plan escalates.
Resist Supergirl grapples with whether or not to obey the president's orders regarding Rhea's latest actions. Meanwhile, Cat Grant returns to National City.
Nevertheless, She Persisted Supergirl challenges Rhea to battle to save National City. Meanwhile, Superman returns; and Cat Grant offers Supergirl some sage advice.