Diana meets a kindred spirit in new girl Tatsu Yamashiro, at the same time the DCSHG encounter a villain who's somehow capable of stealing criminals' souls.
Tropes:
- Adaptational Wimp: Of a sort, since in this version Katana can trap people's souls in her sword, but can only let out every single soul it's absorbed at once. Her comic counterpart's version of the weapon could release specific souls to have a temporary minion with a particular skill.
- Batman Cold Open: The episode opens on Katana stealing the soul of a mugger.
- Black Magic: What Zatanna declares the sword's power to be, the "really icky stuff" to use her words.
- Bookshelf Dominoes: When Diana and Tatsu start fighting in a library, this is the inevitable result.
- Cardboard Prison: Implied in the opening. When Katana confronts the mugger, he thinks she's one of the Superhero Girls and brags that he'll just get out of prison to do it all over again. This, in fact, is Katana's justification for taking criminals' souls, to ensure they never commit crimes ever again.
- Deliberately Monochrome: Of the desaturation variant. Anyone who loses their soul has their body left desaturated.
- Face Doodling: Supergirl can't resist vandalizing the lifeless bodies of their enemies, with Zatanna's "borrowed" lipstick.
- I Am Not Left-Handed: Used word for word by Diana she reveals to Tatsu that she doesn't spar with her dominant hand in order to give her opponents a chance, but averted when Tatsu says that she is actually left-handed (although every scene after she's animated using her right).
- Killed Mid-Sentence: In a variation, Harley had her soul taken when she was spray painting "Batman Drools!" on a wall; when they find her, she had only gotten to "Batman Droo".
- Know When to Fold 'Em: The crook at the beginning is under no delusion that he can escape a superhero.
- Let Us Never Speak of This Again: Said word for word by Catwoman, when everyone gets their souls back and find themselves in a fake slumber party Batgirl set up to distract her father.
- Loophole Abuse: Subverted; the library prohibits loud fighting specifically, because "This is Metropolis. It's the best we can hope for." As long as Diana and Tatsu keep their fighting quiet, they are allowed to stay.
- My God, What Have I Done?: Katana realizes the error of her ways when Wonder Woman not only takes the bullet for a criminal, he wasn't even a carjacker like Katana thought, he was just locked out of his own car.
- Noodle Incident:
- Just what is Barbara suggesting by saying she's "really good at getting rid of bodies"? What experiences are we talking about...?
- Kara said that finding someone with their soul taken by dark magic was just like a scene in "Exploding Ninja Pirates from Outer Space II". What movies those must be.
- Of Corpse He's Alive: Barbara hides the soulless villains in her room, so to keep her father from getting suspicious, she arranges them to look like they're having a slumber party, rigging a pulley system to move their arms and make them give each other makeovers.
- Pedestrian Crushes Car: After her soul is taken, Giganta falls on Jessica's van, flattening it like it was a cardboard box. Jessica has to make a replica van with her ring.
- Running Gag: Bumblebee asking "Now what?" with another "now" every time they find another de-souled villain.
- Taking the Bullet: Diana jumps in front of Katana's attack to save a man breaking into a car, and gets her soul taken instead of him.
- Tempting Fate: As Barbara drags Catwoman and Harley to Jessica's van, she says that at least it's just two bodies. Then Giganta falls on the van, crushing it.
- Throw the Book at Them: During the fight at the library, Tatsu fends off Diana by throwing books at her, with comically appropriate titles.
- Workout Fanservice: While exercising with Tatsu, Diana shows off just how much her gorgeous, Amazonian physique can do while wearing a very revealing sports bra and tights.
- Your Soul Is Mine!: Katana's namesake lets her steal the souls right out of her opponents.
