Here's how Ariel's nightmare goes in Return of Darth Sidious
[that night, we see Ariel having trouble sleeping.]
[In her dream world]
[we see the kingdom's falling and then we see Stormtroopers marching as there are Jedi but outnumbered]
[we then view a cloaked figure killing Jedi]
[but then as it kills another, the hood comes off and it reveals to be Blythe!]
Ariel: No... Blythe. It doesn't have to be like this.
Blythe Baxter: You don't know the powers of the Dark side! The dark side gives me great power! More than what I've ever had!
Ariel: [activates her lightsaber] I don't want to do this!
Blythe Baxter: [evil smiles and walks closer]
Ariel: [holds her lightsaber for action]
Blythe Baxter: Come on, Ariel. Don't do this, join the Dark side!
[The 2 clash their sabers]
[they then clash their sabers at different angles but then Blythe Force pushes Ariel to a wall and then throws her to the ground]
Blythe Baxter: Now, die. [she starts shocking her with force lightning]
Darth Vader: Do it, my apprentice!
Darth Sidious: Wait!
[Blythe then stops as the Emperor approaches Ariel]
Ariel: [groaning in pain]
Darth Sidious: Turn her to our side.
Trooper: Yes sir!
[then the troopers fire a laser at her]
[Back in reality]
Ariel: [wakes up]
Flounder: Ariel, are you alright?!
Ariel: Flounder, I had the most awful dream.
Flounder: What happened?
Ariel: The Sith was their. And Blythe...
[the next day, Ariel is explaining her dream]
Ariel: And then Blythe and I were in a lightsaber duel, then she was about to kill me, but Sidious stopped her. And then they turned me to the dark side.
Sunil Nevla: Ooh, my!
Zoe Trent: That's just awful! Our Blythe a Sith?! [she falls to her belly and whimpers like a helpless puppy]
Gail Trent: [patting her back]
Penny Ling: Oh my, Blythe a Sith?! That would be terrible!
Minka Mark: Yeah!
Vinnie Terrio: Yeah! Blythe's a Jedi Knight! She would betray the Jedi if she became a Sith!
Blythe Baxter: Well, that's gonna happen anytime soon.
Zoe Trent: [buries her face in Blythe's chest] BLYTHE!! I DON'T WANT YOU TO BE A SITH!! [starts crying]
Blythe Baxter: [starts Stroking Zoe] It's okay, Zoe.
Mitzi: But what about Ariel becoming a Sith in her dream? What do you recon that means?
Princess Celestia: His name is Darth Sidious. I watched him become a Jedi in his youth.
Hiccup: Darth Sidious? Is he the emperor who runs the Sith?
Princess Luna: Yes, he was willing to become Jedi Knight.
Princess Celestia: But he was not ranked as one. I tried to help him, but he turn cruel and learned the ways of the Sith. And he was banished in the outer rim planets in the galaxy, and began his own life.
Astrid: And then he set Darth Maul, right?
King Solar Flare: That is correct, Astrid.
Princess Celestia: And Count Dooku as well.
Cadance: Then there was General Grievous.
Brian: General Grievous?
Skyla: Is he a Sith, Mommy?
Cadance: No, sweetie. He's a droid general of the droid army. He doesn't know the ways of the force, but Count Dooku trained him by using a lightsaber, he uses 2 in hand-to-hand combat. And he has four arms to attract and he kills Jedi and takes their lightsabers as trophies, so he can use them for himself.
Princess Luna: Then, came the worst one of them all.
Hiccup: You don't mean..
Princess Celestia: Darth Vader.
[we hear a pipe organ playing a dramatic tune]
Pepper Clark: Pinkie! Cut the music!
Pinkie: [playing the pipe organ]
Brian: Don't do that.
Pinkie: [stops] Sorry.
Princess Celestia: Darth Vader was a vicious man, he was once a Jedi, but he was manipulated by Sidious. And he helped Sideous create the most deadly weapon that ever stood.
Princess Luna: Bigger than Equestria and Berk.
Cadance: More powerful than the Bewilder beat.
Princess Celestia: And that weapon was...
Royals: THE DEATH STAR!!!!
Everyone: The Death Star?
King Solar Flare: The Death star was a powerful moon sized Space Station that had the destructive capacity to destroy an entire planet!
Belle: An entire planet?!
Princess Celestia: Yes. But we had help from Luke Skywalker and we destroyed it. But Sideous is still out there. Planning who knows, what.
Princess Luna: Yes.