Season Four Episode Guide

Supergirl (401) - American Alien

American Alien

Episode #: 401
Air Date: 10.14.18
Our Rating:

A brother-sister team with ties to the Luthors attack an alien scientist, prompting John to suspect a new, anti-alien movement in National City. Kara helps a new cub reporter at Catco, and Lena worries about James' impending indictment for vigilantism.
Supergirl (402) - Fallout

Fallout

Episode #: 402
Air Date: 10.21.18
Our Rating:

As the country is rocked by a shocking revelation about the President, Mercy Graves targets the alien masking technology inside L-Corp. After Brainy and Nia feel the sting of anti-alien bias first-hand, Nia turns to James Olsen to intervene.
Supergirl (403) - Man of Steel

Man of Steel

Episode #: 403
Air Date: 10.28.18
Our Rating:

Ben Lockwood faces a rapidly-changing world when the government welcomes off-world aliens as American citizens, which he perceives to be a threat to his family and the family steel business -- slowly transforming from a mild-mannered professor into the villainous Agent Liberty.
Supergirl (404) - Ahimsa

Ahimsa

Episode #: 404
Air Date: 11.04.18
Our Rating:

J'onn teams up with a man named Manchester Black to search for Fiona, ending up on the trail of the anti-alien movement. Supergirl struggles with her new reality inside a protective suit, and Brainy struggles with his emotions.
Supergirl (405) - Parasite Lost

Parasite Lost

Episode #: 405
Air Date: 11.11.18
Our Rating:

As Alex prepares for Colonel Haley's new role at the D.E.O., Liberty recruits his own Parasite to use against National City's alien population. Kara writes a profile of a legendary alien healer, and is surprised by the negative backlash from the anti-alien community.
Supergirl (406) - Call to Action

Call to Action

Episode #: 406
Air Date: 11.18.18
Our Rating:

James tries to get loser to the Children of Liberty, while Manchester Black conducts an interrogation. Lena and Miss Tessmacher experiment to try and unlock the powers of the Harun-El, and Colonel Haley flexes her authority at the D.E.O.
Supergirl (407) - Rather the Fallen Angel

Rather the Fallen Angel

Episode #: 407
Air Date: 11.25.18
Our Rating:

James gets a face-to-face meeting with Agent Liberty, who intends to use James for propaganda. Meanwhile, Lena begins morally dubious human trials in what she hopes will give regular people super powers.
Supergirl (408) - Bunker Hill

Bunker Hill

Episode #: 408
Air Date: 12.02.18
Our Rating:

Manchester Black confronts Ben Lockwood in his home, placing Lockwood's wife in danger. When Nia has a powerful and distressing dream, Brainy and Kara help her to embrace her secret abilities to track down Agent Liberty.
Supergirl (409) - Elseworlds, Part 3

Elseworlds, Part 3

Episode #: 409
Air Date: 12.11.18
Our Rating:

After Dr. Deegan takes another shot at rewriting reality Oliver and Barry find themselves on the run from the law, with Kara locked up inside Star Labs -- and a dark Superman reigning supreme.

Suspicious Minds

Episode #: 410
Air Date: 01.20.19

Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. 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. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers. (The CW)

Blood Memory

Episode #: 411
Air Date: 01.27.19

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. Meanwhile, Alex deals with a street drug that is turning people violent and giving them temporary superpowers. (The CW)