This is how the takeover of the Nightmare Family goes in Night Furies vs. The Nightmare Family Part 2.
[previously on The Chronicles of Equestira and The Isle of Berk]
Princess Luna: I'm pregnent!
Princess Luna: Mm-hmm.
Nightmare Moon: And now, it's time for you to feel a nightmare. [evil giggles]
Yuna: NO! NO!! NOO!!!
Hicuup: [gasp] (panting) Thor Almighty, that was intense!
Astrid: [to herself] Hiccup, I know there's something wrong and I intend to find out.
Yuna: I had another nightmare!
Princess Luna: I saw it. and I'm afraid that the Nightmare Family is free!
Princess Luna: But from what I can tell, they seem to be targeting you and Yuna.
[everyonne gasps as Nightstar and Toothless are shocked]
King Sombra: Not so tough for a viking.
Nightmare Moon: And now, Equestria will be ours!!
[back to the episode]
[The 2 continue laughing]
Nightmare Moon: You may of defeated me once, but this time, I will win!
???: Stop that!
???: no, you!
[We see 2 black equines fighting]
King Sombra; [groans] Not this again.
[then another black stallion wearing blue armor walks and picks them up]
???: Alright! Break it up!
Older black mare: Yes, honey.
Younger black mare: She started it!
Black stallion: I don't care! I'll end it!
Nightmare Moon: At ease, my partner.
Black stallion: As you wish.
[he then steps into the light and reveals to be Nightmare Hiro]
Princess Luna: Nightmare Hiro.
Nightmare Hiro: Were you expecting Clint Eastwood?
Younger black mare: Can you put us down?!
Older mare: Shut up, Black Hole!
Younger mare: No, you shut up, Trix!
Nightmare Moon: SILENCE!!!!
Mares: [in unison] Yes, mommy.
[Nightmare Hiro sets them down]
Astrid: Didn't you say they also had a train?
Princess Luna: Yes, I did.
Tuffnut: I don't see one.
???: That would be me.
[we now see Cerberus pull in]
Princess Luna: Cerberus.
Cerberus: Hello, Luny darling, no time no see. And is that your daugther? My, has she grown.
Black Hole: See almost looks good enough to eat.
Nightmare Trix: Well what the blue and white one? She's blind.
Nightmare Moon: Okay! We get it! Now, prepare for eternal darkness!
Princess Luna: GUARDS!!
[the Royal guards then race in]
Princess Luna: [to the others] Let's get out of here while we can.
Fishlegs: You read my mind!
[However, the mares block Yuna and Snowdorp's way]
Black Hole: Going somehwere?
Yuna: Yeah! Out of here!
Nightmare Trix: Then you'll have to go through us.
Astrid: [draws her axe] OUTTA OF THEIR WAY, SKUNKBAGS!!! [smacks them with her axe, sending them to the side]
Princess Luna: [grabs Yuna and Snowdrop] Nice one, Astrid.
[they race out fo the castle]