Supergirl Photos: Lex Luthor Returns to National City!

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Deadly things are about to go down on Supergirl Season 4 Episode 15, titled "O Brother, Where Art Thou?"

Picking up immediately where Supergirl Season 4 Episode 14 ended, Supergirl is ready to get revenge for James being shot. 

Related: The CW Renews 10 Dramas: Which Shows Made the Cut?

Then there's Lex Luthor who makes a triumphant return, but he's got a horrifying plan in place. 

Have a look at the photos below. 

Remember you can watch Supergirl online right here via TV Fanatic. 

Supergirl airs Sundays at 8/7c.

1. Kara and Alex Hug It Out - Supergirl

Kara and Alex Hug It Out - Supergirl
Kara and Alex hug it out in a still from Supergirl Season 4 Episode 15.

2. Welcome, Kelly Olsen - Supergirl Season 4 Episode 15

Welcome, Kelly Olsen - Supergirl Season 4 Episode 15
Kelly Olsen comes to town, and it sounds like she's going to be in a difficult position.

3. Making Friends - Supergirl Season 4 Episode 15

Making Friends - Supergirl Season 4 Episode 15
Alex and Kelly bond as they realize that James is in a lot of trouble.

4. What Do We Do? - Supergirl Season 4 Episode 15

What Do We Do? - Supergirl Season 4 Episode 15
With James in the hospital, it's up to Kara and J'onn to take down those responsible.

5. Supergirl to the Rescue Season 4 Episode 15

Supergirl to the Rescue Season 4 Episode 15
Supergirl finds James and he's been shot. Will he survive?

6. On a Mission - Supergirl Season 4 Episode 15

On a Mission - Supergirl Season 4 Episode 15
Supergirl is ready for a battle with Manchester Black.

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Supergirl Season 4 Episode 15: "O Brother, Where Art Thou?"
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Supergirl Season 4 Episode 15 Quotes

Lex and Lena Luthor, teaming up to save Superman's best pal. What would mother think?

Lex Luthor

I'm not the one who accidentally poisoned myself with Kryptonite in a quixotic attempt to kill an invincible man. And while I do find the irony that you now need the Black Kryptonite to cure yourself just delicious, you are my brother, Kex. I do want to save you. Besides, how can you pay your debt to society if you're already dead?

Lena