- "You know, it's from Bunker Hill. Remember that one? It's the one where the Brits, uh, thought they had won, but the battle ended up so bloody, that it cost them the war, and it wasn't worth it."
- —Ben Lockwood to Manchester Black about Lockwood’s great-great-great-great-great-great-great-great-great-great-grandfather's bayonet
"Bunker Hill" is the eighth episode of the fourth season of , and the seventy-third episode overall. It aired on December 2, 2018.
|Nia has a powerful dream about Agent Liberty, but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara enlists Brainy’s help and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black pays Ben Lockwood a menacing visit.|
- Melissa Benoist as Kara Danvers/Supergirl
- Mehcad Brooks as James Olsen
- Chyler Leigh as Dr./Director Alex Danvers
- Katie McGrath (credit only)
- Jesse Rath as Querl Dox/Brainiac 5
- Sam Witwer as Professor Ben Lockwood/Agent Liberty
- Nicole Maines as Nia Nal
- April Parker Jones as Colonel Lauren Haley
- David Harewood as J'onn J'onzz
- Bruce Boxleitner as President Phil Baker
- David Ajala as Manchester Black
- Sarah Smyth as Lydia Lockwood
- Roxy Wood as Yvette
- Josh Chambers as First Local
- Jeffrey Chivers as Col #1
- Timothy Lyle as Frank
- Jaymee Mak as Mackenzie
- Jill Morrison as Second Local
- Tawny West as Reporter
"Bunker Hill" begins with Nia having a bad dream of sorts — she has clairvoyant\precognition powers that, while dreaming, permit her to witness events before they occur. At work, Kara confronts Nia about deceiving everybody at Thanksgiving about having narcolepsy.
Ben Lockwood gets back to his wife advising him regarding a previous school cohort appearing. Its learned Manchester Black showed up to the house to hurt Lockwood. J'onn utilizes his telepathy to caution Manchester not to do anything. Lockwood's wife flees and Manchester threatens to shoot Ben.
Kara visits Nia's home to talk with her about her powers. There, Nia reveals she's from a planet called Naltor. Kara brings in Brainy, who shares that he too is an outsider. Brainy puts Nia into her dream state, where she keeps seeing the lady in torment from earlier.
Nia awakens and says they have to go to Collinwood High School since that is the place the woman in distress is.
Back at the Lockwood’s, Manchester, armed with a knife, is holding both of the Lockwoods prisoner and blaming Ben for being Agent Liberty. J'onn attempts to stop Manchester through telepathically again, this time without success.
Nia shows up at Collinwood with Kara and Brainy and we see one of the other Liberty operators with an outsider search dog. Kara quickly realizes he's with two different outfits. Kara devises a plan where she deals with the operators while Brainy watches over Nia and prevents her capture & being forced to work for the bad guys.
Kara approaches the gathering and a van pulls up to toss her in. Nia looks down the road and notices the uproar. She runs back and Brainy is compelled to follow. The gang captures them and takes them to their hideout.
There, the bad guys get anxious and decide to shoot Nia, who foresees the event. She's ready and moves so the bullet breaks her cuffs and she rescues Brainy & Kara. Chaos ensues as the good guys subdue the bad guys.
Ben takes Manchester and his better half to the cellar of the Lockwood home and Ben reveals that he is, actually, Agent Liberty.
Kara does some exploring and confirms that they're at Lockwood Family Steel. The trio deduces Ben Lockwood being Agent Liberty and Kara calls Alex to check whether she can confirm. Alex has a Child of Liberty in custody and, after a quick interrogation, verifies that Lockwood is Agent Liberty.
Manchester makes Ben suit up in his Agent Liberty togs and accuses him of Fiona’s murder. J'onn utilizes his mental abilities again and Manchester says the only way he'll stop is if J'onn kills him, which J'onn cannot. Manchester and Ben fight but Ben escapes, with Manchester in pursuit.
Kara leaves the steel processing plant to support Manchester, yet she experiences difficulty finding them since they're no longer at the Lockwood living arrangement.
Brainy and Nia begin searching the production line. Nia recognizes that this is the place from her visions.
Ben leads Manchester directly to the steel manufacturing plant. Manchester's going to shoot Lockwood when Kara flies in and stops him. They argue about murdering Lockwood. Eventually, Manchester douses Kara with Nth metal, immobilizing her.
Lockwood's wife shows up and distracts Manchester. Ben is about to kill Manchester when Supergirl breaks free and stops him, also rescuing Mrs. Lockwood from plunging to her death. National City police show up to arrest Lockwood and Manchester.
Kara flies back to the DEO and is amazed to find President Baker. There, he tells Kara that she needs to put her nation first and publicly reveal her secret identity. She refuses and Baker dismisses her from the DEO.
Protesters gather at the prison and CatCo Media.
The scenes closes with the Monitor’s destruction of the heroes of Earth-90. The Flash from Earth-90 manages to get away.
- In her nightmare, Nia is watching the 1959 film North by Northwest.
- After Frank says that he is Agent Liberty, Brainy compares the situation to the 1960 film Spartacus, in which a group of soldiers show their loyalty to the titular character by not letting him turn himself over, but all claiming to be Spartacus.
- When Nia, Kara, and Brainy visit Collinwood, the former compares the deserted streets to the 2013 film The Purge.
- Manchester calls Supergirl "Pollyanna", referencing the book series of the same name.
- After swinging a hook to stop Manchester, Brainy mentions the 1991 film Hook.
- When guiding Nia through her dreams, Brainy accidentally calls her "Nura". This is a reference to Nura Nal, a member of the Legion of Superheroes in the 30th and 31st centuries, known in the comics as Dream Girl.
- Nia Nal has been confirmed to be Nura's ancestor in the Arrowverse.
- The episode ends with the cold open from the crossover "". Unlike the rest of this episode, this scene was directed by Tom Cavanagh.
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