Miraculous and The Flash crossover: Collision of Worlds. (Book 4)

In the Atelier of the Agreste Mansion, Gabriel stands at his console, and attempts to process what he has just seen, regarding the recent battle between the Ladybug, Cat Noir, and Flash, and the two villains.

Gabriel: So, it appears that Reverse Flash, and his associate finally showed themselves, after all.

Nathalie, wearing her leg brace from Tsurugi's company on her waist, steps into the Atelier.

Nathalie: (Coughs) Did you find out anything about their plan, sir?

Gabriel: No, Nathalie, I haven't. But I think I've found something else.

He inspects another strip of footage. Nathalie walks up to see what he's talking about. He pauses the screen, and zooms in on the footage from the helicopter.

Gabriel: Look! That, right there!

The freeze frame shows Falena Falco being held by Ladybug.

Nathalie is completely taken by surprise.

Nathalie: Is that-?!

Gabriel: It is. The Hawk Moth of the Future.

Nathalie: But who could it possibly be?

Gabriel thinks for a second.

Gabriel: Perhaps we should find out.

He pulls up the security camera footage from City Hall.
And it shows a rush of red lightning dropping the three heroes at the feet of a young woman. Although her face is barely visible, a wave of purple energy washes over her. And she transforms into Falena Falco.

Nathalie: Wait, go back a bit.

He rewinds the video a little bit, right as the woman is about to transform.

Nathalie: Right there! Freeze it!

He pauses the video, right before the purple energy washes over her head. The light from the energy illuminates her face.

Gabriel and Nathalie's eyes widen in surprise at the person behind Falena Falco's mask.

Gabriel: It can't be, it couldn't be!

Nathalie: I'm afraid it is, sir!

Gabriel: Lila Rossi! But that's impossible!

Nathalie looks up in realization, before turning to her boss.

Nathalie: Sir, don't you remember what Reverse Flash said? "Someone who accomplished more in a single day, than you have in months of planning."

Gabriel tightly clenches his fists, furiously

Gabriel: That blasted little traitor!

(BANG! CRRRACK!)

He slams his fist into the console, knocking it over. The screen, now cracked and broken.

Nathalie, meanwhile, stayed emotionless as usual. She was no stranger to her boss throwing a temper tantrum, at least when it came to the Miraculous.

Nathalie (TB): "I swear, Gabriel can be so childish, sometimes. His own son has more maturity than this. Oh, well. Best to just let him ride it out, I suppose."

He stays furious for a few seconds, but he quickly changes his demeanor and calmly turns to Nathalie.

Gabriel: Remind me to replace that console, tomorrow.

Nathalie nods, and adds it to her tablet's to-do list.

Nathalie: Very well, Mr. Agreste. Is there anything else you need, sir?

Gabriel: No, I won't. Good night, Nathalie.

She nods and walks out of the Atelier, and heads back to her quarters.
Leaving a slightly irritated Gabriel Agreste, by himself.

Gabriel (TB): “I won't let that villainous, futuristic, copycat jeopardize my plan. Those Miraculous will be mine.”