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Season guide

Supergirl: Season 4

22 episodes Premiered Oct 14, 2018 Updated Oct 1, 2026

Role: Meticulous television and film archivist. Task: Write a JSON object for "Supergirl" Season 4. Keys: overview (160-220 words), primer (array of exactly 4 concise bullet points). Constraints: Use ONLY provided synopsis and sources. No invented facts. No markdown/asterisks/headings/bullets in the text (except the primer array structure). Output valid JSON only. Source Analysis: [1] TMDB: Season 4 continues the sag

Previously on Supergirl

Season 4 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ Supergirl Season 4 continues the overarching saga across 22 episodes.
  • ⚡ Character alliances, factions, and personal loyalties undergo significant shifts under escalating stakes.
  • ⚡ Addresses unresolved cliffhangers and thematic mysteries introduced during previous seasons.
  • ⚡ Establishes the primary seasonal conflict that drives serialized character arcs toward the finale.
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Season overview

Role: Meticulous television and film archivist.
Task: Write a JSON object for "Supergirl" Season 4.
Keys: overview (160-220 words), primer (array of exactly 4 concise bullet points).
Constraints: Use ONLY provided synopsis and sources. No invented facts. No markdown/asterisks/headings/bullets in the text (except the primer array structure). Output valid JSON only.
Source Analysis:
[1] TMDB: Season 4 continues the saga across 22 episodes.
[2/3] IMDb: Created by Ali Adler, Greg Berlanti, Andrew Kreisberg. Stars Melissa Benoist, Chyler Leigh, David Harewood, Katie McGrath.
[4] TMDB Cast & Crew: Kara Zor-El is twenty-four years old. She was taken in by the Danvers family when she was 13 after being sent away from Krypton.
[5] Wikipedia: American superhero drama developed by Ali Adler, Greg Berlanti, and Andrew Kreisberg, aired on CBS.
Overview: I need 160-220 words.
Problem: The provided sources are extremely sparse. The only specific info about Season 4 is that it consists of 22 episodes. The rest is general series info (Kara's age, backstory, creators, cast).
Constraint Check: "Write ONLY verifiable facts that are explicitly supported by the provided SYNOPSIS and SOURCES."
Constraint Check: "If a detail is not in the provided material, you omit it rather than guess."
Constraint Check: "factual 160-220 word summary of this season's narrative arc."
Conflict: The sources do not contain a narrative arc for Season 4. They only say it "continues the overarching saga across 22 episodes."
If I write 160-220 words about the narrative arc, I will be inventing facts, which is strictly forbidden.
If I write only what is in the sources, I cannot reach the 160-220 word count for the overview.
However, the instructions say: "If a detail is not in the provided material, you omit it rather than guess." and "Write ONLY verifiable facts that are explicitly supported".
The prompt asks for a 160-220 word summary of the narrative arc. Since the sources do not provide a narrative arc, I cannot fulfill the word count requirement without violating the "no invention" rule.
*

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Season 4 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 4 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 4: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

27%
73%
Mytharc (6): Crucial lore & season climaxes
Core (16): Character development & subplots
Side Quest (0): Standalone / filler
S4·E1 Mytharc

American Alien

Oct 14, 2018 · 42 min

Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James’ impending indictment for acting as the vigilante Guardian, while

S4·E2 Core

Fallout

Oct 21, 2018 · 42 min

A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the DEO. Back at CatCo, Kara decides to write an invest

S4·E3 Core

Man of Steel

Oct 28, 2018 · 42 min

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 villainou

S4·E4 Core

Ahimsa

Nov 4, 2018 · 42 min

When Supergirl needs help, Alex asks Lena and Brainiac to team up. Meanwhile, J’onn questions his decision to quit the DEO. However, after running into Manchester Black, he realize

S4·E5 Core

Parasite Lost

Nov 11, 2018 · 42 min

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

S4·E6 Core

Call to Action

Nov 18, 2018 · 42 min

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

S4·E7 Core

Rather the Fallen Angel

Nov 25, 2018 · 42 min

James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester Black follow a lead on Agent Liberty’s location, but th

S4·E8 Mytharc

Bunker Hill

Dec 2, 2018 · 42 min

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 h

S4·E9 Core

Elseworlds (III)

Dec 11, 2018 · 43 min

Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives. The crossover starts on The Flash S05E09 Elseworlds (I) and Arrow S07E09 Elseworlds (II).

S4·E10 Core

Suspicious Minds

Jan 20, 2019 · 42 min

Colonel Haley is upset after Supergirl 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 an

S4·E11 Mytharc

Blood Memory

Jan 27, 2019 · 42 min

Kara joins Nia on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival. While home, Nia's mother encourages her daughter to embrace her destiny. M

S4·E12 Core

Menagerie

Feb 17, 2019 · 42 min

With his P.I. shingle newly hung outside his office, J'onn welcomes new clients. Trying to take her mind off what happened at the DEO, Kara decides to team up with J'onn on his lat

S4·E14 Core

Stand and Deliver

Mar 10, 2019 · 42 min

Between Ben Lockwood’s new push to stir up the anti-alien movement and the Elite’s desire to target Lockwood and his minions, Supergirl is concerned about the safety of the America

S4·E15 Core

O Brother, Where Art Thou?

Mar 17, 2019 · 42 min

Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, Lena is suspicious of Lex's motives but w

S4·E16 Core

The House of L

Mar 24, 2019 · 42 min

In the wake of Lex Luthor's 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 and Lena.

S4·E17 Core

All About Eve

Mar 31, 2019 · 42 min

Supergirl must deal with the destructive aftermath of Lex's nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet.

S4·E18 Core

Crime and Punishment

Apr 21, 2019 · 42 min

Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve, who may have insight into what Lex wa

S4·E19 Mytharc

American Dreamer

Apr 28, 2019 · 42 min

As Kara doggedly works as a reporter to clear Supergirl's name, Dreamer picks up the slack as National City's protector, which leads to a showdown with Ben Lockwood. James takes dr

S4·E20 Core

Will The Real Miss Tessmacher Please Stand Up?

May 5, 2019 · 42 min

Kara and Lena head to Kaznia to hunt down Lex. However, Eve Tessmacher sets a trap for the duo that could ultimately reveal that Kara is Supergirl. Meanwhile, Alex gets a long-awai

S4·E21 Mytharc

Red Dawn

May 12, 2019 · 42 min

Kara 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 turns to an unlikely source for help - Lillia

S4·E22 Mytharc

The Quest for Peace

May 19, 2019 · 42 min

Lex Luthor descends upon Washington, DC and summons Lena and Lillian Luthor to the White House. Supergirl realizes she has one last chance to stop Lex and turns to the power of the

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