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Supergirl
Season 4
Episode Guide
This guide does not list airdates for repeat showings.
Episodes
- The American Alien - Summary
- Fallout - Summary
- Man of Steel - Summary
- Ahimsa - Summary
- Parasite Lost - Summary
- Call to Action - Summary
- Rather the Fallen Angel - Summary
- Bunkerhill - Summary
- Elseworlds (3-Part Crossover)
- Suspicious Minds - Summary
- Blood Memory - Summary
- Menagerie - Summary
- What's So Funny About Truth, Justice and The American Way? - Summary
- Stand and Deliver - Summary
- O Brother, Where Art Thou - Summary
- The House of L - Summary
- All About Eve - Summary
- Crime and Punishment - Summary
- American Dreamer - Summary
- Will The Real Miss Tessmacher Please Stand Up? - Summary
- Red Dawn - Summary
- The Quest for Peace - Summary
Summaries
"The American Alien"
Diving back into reporting, Kara (Melissa Benoist) welcomes a new cub reporter to CatCo. Meanwhile, James (Mehcad Brooks) and Lena (Katie McGrath) argue about James' impending indictment for acting as the vigilante Guardian, while Alex (Chyler Leigh) and Brainy (Jesse Rath) struggle to get in sync at the DEO. Supergirl (Melissa Benoist) is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J'onn (David Harewood) relishes his peaceful new life, but an outing with an old friend causes him concern.Read our review of this episode in the "Supergirl: Episode Reviews".
"Fallout"
A shocking revelation causes chaos in National City. Supergirl (Melissa Benoist) sets out to capture Mercy Graves (guest star Rhona Mitra), while Alex (Chyler Leigh) takes control at the DEO. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena (Katie McGrath) if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy (Jesse Rath) meets Nia (Nicole Maines) and the two end up in a precarious situation.Read our review of this episode in the "Supergirl: Episode Reviews".
"Man of Steel"
Ben Lockwood (Sam Witwer) didn't always hate aliens. Through a series of incidents, and input from his anti-alien father (guest star Xander Berkeley), Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty of today.Read our review of this episode in the "Supergirl: Episode Reviews".
"Ahimsa"
When Supergirl (Melissa Benoist) needs help, Alex (Chyler Leigh) asks Lena (Katie McGrath) and Brainiac (Jesse Rath) to team up. Meanwhile, J'onn (David Haredwood) questions his decision to quit the DEO. However, after running into Manchester Black (guest star David Ajala), he realizes there are a lot of ways to help his fellow aliens during this tumultuous time.Read our review of this episode in the "Supergirl: Episode Reviews".
"Parasite Lost"
Colonel Haley (April Parker Jones) makes a surprising decision regarding Supergirl (Melissa Benoist). Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them. Unfortunately, the article puts some of the aliens in harm's way.Read our review of this episode in the "Supergirl: Episode Reviews".
"Call to Action"
Everyone gathers for Thanksgiving but Kara (Melissa Benoist) is feeling down after her televised debate with Ben Lockwood (Sam Witwer) about the anti-alien sentiment coursing through National City. Meanwhile, James (Mehcad Brooks) and Lena (Katie McGrath) argue about the best way to handle the Children of Liberty.Read our review of this episode in the "Supergirl: Episode Reviews".
"Rather the Fallen Angel"
James (Mehcad Brooks) falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty (Sam Witwer). Meanwhile, Supergirl (Melissa Benoist) and Manchester Black (guest star David Ajala) follow a lead on Agent Liberty's location, but things take a dark turn. Lena (Katie McGrath) kicks off her first set of trials.Read our review of this episode in the "Supergirl: Episode Reviews".
"Bunker Hill"
Nia (Nicole Maines) has a powerful dream about Agent Liberty (Sam Witwer) but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara (Melissa Benoist) enlists Brainy's (Jesse Rath) help, and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black (guest star David Ajala) pays Ben Lockwood a menacing visit.Read our review of this episode in the "Supergirl: Episode Reviews".
"Elseworlds" (Part 1)
When Barry Allen (Grant Gustin) and Oliver Queen (guest star Stephen Amell) wake up one morning and realize they have swapped bodies with each other, the two set off to find out what disturbed the timeline to cause such a shift. However, things quickly go from bad to worse when they present their case to Team Flash and the gang doesn't believe them. Barry and Oliver realize they need Supergirl's (guest star Melissa Benoist) help and travel to Smallville on Earth-38 where they end up meeting Kara's cousin, Clark Kent (guest star Tyler Hoechlin), and intrepid reporter, Lois Lane (guest star Elizabeth Tulloch). LaMonica Garrett guest stars as The Monitor.Read our review of this episode in the "Supergirl: Episode Reviews".
"Elseworlds" (Part 2)
With Oliver (Stephen Amell) and Barry (guest star Grant Gustin) still stuck in the other's bodies, the two get a lead on John Deegan (guest star Jeremy Davies) and head to Gotham City with Supergirl (guest star Melissa Benoist) to figure out why their reality has changed. While there, they meet the mysterious Kate Kane (guest star Ruby Rose) who provides them with information that leads the group to Arkham Asylum.Read our review of this episode in the "Supergirl: Episode Reviews".
"Elseworlds" (Part 3)
Supergirl (Melissa Benoist), The Flash (guest star Grant Gustin), Green Arrow (guest star Stephen Amell) and Superman (guest star Tyler Hoechlin) engage in the battle of their lives.Read our review of this episode in the "Supergirl: Episode Reviews".
"Suspicious Minds"
Colonel Haley (April Parker Jones) is upset after Supergirl (Melissa Benoist) responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl's true identity and begins to interrogate all DEO agents, including Alex (Chyler Leigh). Meanwhile, Brainiac-5 (Jesse Rath) tries to persuade Nia (Nicole Maines) to embrace her superpowers but she misinterprets his motives.Read our review of this episode in the "Supergirl: Episode Reviews".
"Blood Memory"
Kara (Melissa Benoist) joins Nia (Nicole Maines) on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival. While home, Nia's mother (guest star Kate Burton) encourages her daughter to embrace her destiny. Meanwhile, Alex (Chyler Leigh) deals with a street drug that is turning people violent and giving them temporary superpowers.Read our review of this episode in the "Supergirl: Episode Reviews".
"Menagerie"
With his P.I. shingle newly hung outside his office, J'onn (David Harewood) welcomes new clients. Trying to take her mind off what happened at the DEO, Kara (Melissa Benoist) decides to team up with J'onn on his latest assignment, which unfortunately ends up tying directly into Alex's (Chyler Leigh) current investigation that involves the villain Menagerie (guest star Jessica Meraz). Meanwhile, Lena (Katie McGrath) shares some news with James (Mehcad Brooks), but his reaction isn't what she expected. Nia (Nicole Maines) invites Brainy (Jesse Rath) to her Valentine's Day party.Read our review of this episode in the "Supergirl: Episode Reviews".
"What's So Funny About Truth, Justice and The American Way?"
Manchester Black (guest star David Ajala) breaks out of prison with the help of his new team, The Elite, who are set on punishing the anti-alien forces. Supergirl (Melissa Benoist) pulls double duty as she tries to apprehend Manchester Black and his team as well as deal with a shocking new development with Ben Lockwood (Sam Witwer).Read our review of this episode in the "Supergirl: Episode Reviews".
"Stand and Deliver"
Between Ben Lockwood's (Sam Witwer) new push to stir up the anti-alien movement and the Elite's desire to target Lockwood and his minions, Supergirl (Melissa Benoist) is concerned about the safety of the American people Ð both human and alien. When Lockwood organizes a rally, the aliens decide to peacefully protest. Brainiac (Jesse Rath) and J'onn (David Harewood) join the alien march while Supergirl and Dreamer (Nicole Maines) patrol to keep everyone safe. Meanwhile, James (Mehcad Brooks) picks up his camera again to cover the march for CatCo, and Hayley (April Parker Jones) assigns Alex (Chyler Leigh) a job that clashes with her beliefs. When The Elite and Ben Lockwood stir up trouble at the rally, Supergirl is forced to take a stand. Jonathan Bennett guest stars.Read our review of this episode in the "Supergirl: Episode Reviews".
"O Brother, Where Art Thou"
Secretly furloughed from prison due to failing health, Lex Luthor (guest star Jon Cryer) visits his sister, Lena (Katie McGrath), 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 (Melissa Benoist) and J'onn (David Harewood) face off against Manchester Black (guest star David Ajala). James' sister Kelly (guest star Azie Tesfai) comes to town.Read our review of this episode in the "Supergirl: Episode Reviews".
"The House of L"
In the wake of Lex Luthor's (guest star Jon Cryer) 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 (Melissa Benoist) and Lena (Katie McGrath).Read our review of this episode in the "Supergirl: Episode Reviews".
"All About Eve"
Supergirl (Melissa Benoist) must deal with the destructive aftermath of Lex's (guest star Jon Cryer) nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet.Read our review of this episode in the "Supergirl: Episode Reviews".
"Crime and Punishment"
Supergirl (Melissa Benoist) and Lena (Katie McGrath) head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Supergirl tries to befriend a nosy prisoner, Steve (guest star Willie Garson), who may have insight into what Lex was doing, but he and all of the prisoners regard her as a traitor to the country and refuse to talk to her. Lena realizes Lex left behind clues for her and deciphering them could be the key to his whereabouts. Meanwhile, Kelly (guest star Azie Tesfai) encourages James (Mehcad Brooks) to talk to someone about his PTSD, and Alex (Chyler Leigh) faces off against Ben Lockwood (Sam Witwer) after he storms the DEO and acquires some powerful weapons to hunt Supergirl.Read our review of this episode in the "Supergirl: Episode Reviews".
"American Dreamer"
As Kara (Melissa Benoist) doggedly works as a reporter to clear Supergirl's name, Dreamer (Nicole Maines) picks up the slack as National City's protector, which leads to a showdown with Ben Lockwood (Sam Witwer). James (Mehcad Brooks) takes drastic measures to relieve his PTSD.Read our review of this episode in the "Supergirl: Episode Reviews".
"Will The Real Miss Tessmacher Please Stand Up?"
Kara (Melissa Benoist) and Lena (Katie McGrath) head to Kaznia to hunt down Lex. However, Eve Tessmacher (guest star Andrea Brooks) sets a trap for the duo that could ultimately reveal that Kara is Supergirl. Meanwhile, Alex (Chyler Leigh) gets a long-awaited phone call, James (Mehcad Brooks) practices using his powers, and Ben Lockwood (Sam Witwer) takes a dangerous stand inside the DEO.Read our review of this episode in the "Supergirl: Episode Reviews".
"Red Dawn"
Kara (Melissa Benoist) 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 (Katie McGrath) turns to an unlikely source for help Ð Lillian Luthor (guest star Brenda Strong). Meanwhile, Alex (Chyler Leigh) realizes she's missing parts of her memory, and Brainy (Jesse Rath), Nia (Nicole Maines) and J'onn (David Harewood) set out to track down aliens who have been abducted by Lex.Read our review of this episode in the "Supergirl: Episode Reviews".
"The Quest for Peace"
Lex Luthor (guest star Jon Cryer) descends upon Washington, DC and summons Lena (Katie McGrath) and Lillian Luthor (guest star Brenda Strong) to the White House. Supergirl (Melissa Benoist) realizes she has one last chance to stop Lex and turns to the power of the press to help her.Read our review of this episode in the "Supergirl: Episode Reviews".