This is how The Doom Raiders join Matau and the Skylanders and the Rainbooms and A Mesmerized School goes in Ryan's and Crash's adventures of My Little Pony: Equestria Girls - Rainbow Rocks.
Matau T. Monkey: My twin is one of those sirens.
Sunset Shimmer: How did you know that?
Matau T. Monkey: Lucky guess. While Buck survive, you hypnotized Rigby when you got that crown on your head.
Rigby (EG): At least Sunset doesn't send Ryan to a world inhabited by sock people.[shudders]
Predaking (EG): These girls and boys are sirens. They got pendants. Where is Cupcake and Sally Contralto?
Rigby (EG): They went off somewhere to chat.
Cody Fairbrother: Oh. This day keeps getting better and better. I guess we're the ones who are immune. How is that possible?
Human Applejack: Cody's right, Y'all.
Sir Daniel Fortesque (EG): Let me get this on the right track. Ryan and Twilight got her crown back to Equestria and maybe some of it's magic stayed behind somehow.
Matau T. Monkey: My thoughts exactly.
Garfield (EG): And this magic happens when we play music. Correct?
[They all nod]
Buck the Wiesel (EG): We should tell the principles about this. We can have these new ones reformed. Eye of the tiger. [do some poses] Hadouken!
Matau T. Monkey: Paper covers rock. But, paper can't stop rocks.[in N. Brio's voice] IT MAKES NO SENSE!
Sunset Shimmer: You know what? Buck's right. We should tell the principles about what happened back there.
Wreck-It Ralph (EG): How did Matau say N. Brio's line. I don't want this event almost demolished by a power-crazed boy.[to Cody] No offence, buddy.
Cody Fairbrother: [sighs] None taken.
[In Celestia's office]
Matau T. Monkey: These new ones Cody and Sunset saw has got dark magic, Principle Celestia.
Principle Celestia: Dark magic? I find that rather difficult to believe.
Buck The Wiesel (EG): You would, mate. We saw them singing at the cafeteria and Cupcake and Contralto is chatting to em. I think it's a tad right.
Principle Celestia: But they came into my office earlier and were absolutely delightful.
Vice Principle Luna: Ugh! Perhaps Sunset Shimmer and Cody Fairbrother are just eager to make someone else out to be a bad element, so that their actions at the Fall Formal will become old news.
Buck The Wiesel (EG): [sighs] That's the event that cost me my eye.
Sunset Shimmer: I can see why you may think that but...
Darksteel (EG): That is not the point. Tell them, Cody.
Cody Fairbrother: These two bands did sing at the cafeteria.
Principle Celestia: Well, aren't your bands supposed to be in the showcase?
Matau T. Monkey: Yeah. I suppose this is what you said but I'm not worried.
Vice Principle Luna: Then it's probably that you're afraid that the Dazzlings and the Cyberlings will steal your spotlight.
Human Applejack: The Dazzlings?
Batman (The LEGO Movie): The Cyberlings?
Principle Celestia: It's the names of their music groups. That's why they came into my office earlier. To sign up for the showcase. Even sang a little song to Luna and I.
Skylynx (EG): They did? What song?
Predaking (EG): I think it was just vocals, Skylynx.
Batman (The LEGO Movie): Guess they are ok without saying about having a battle of the bands is a good idea.
Principle Celestia: Yes, Skylynx. And we think that having a Battle of the Bands instead is a wonderful idea.
Batman (The LEGO Movie): Hello? Principle Celestia? Vice Principle Luna?
[Their eyes glow green, purple, orange and blue]
Matau T. Monkey: You're ok?
[Cody waves his hand over their eyes and try to snap them out of their trance]
Mordecai (EG): We should talk outside.
Rigby (EG): Ok. I'll fetch Rainbow Dash's ball.
[Cody sighs and hugs Sunset]
Garfield (EG): I can't see how these sirens sang to us.
Human Fluttershy: What I can't believe, Garfield, is that they got Principle Celestia and Vice Principle Luna too.
Rigby (EG): Yeah. They got to everyone we know and love.[his eyes glow orange, green, purple and blue]
Batman (The LEGO Movie): Rigby! Not you too?
Cody Fairbrother: They got to everybody including Rigby.
Wolfgang (Skylanders): Not everyone, man. My fellow Doom Raider are immune to their singing thanks to my harp.
Human Pinkie Pie: Wow! He does know what I was going to say.
[Cody waves at Rigby (EG) face to try to snap him out of the spell]
Batman (The LEGO Movie): Cody. Give up. He's under their spell.
Rigby (EG): Now if you'll excuse me, I have a battle to win.
[Cody grunts and slaps Rigby (EG) and his eyes stop glowing]
Rigby (EG): Ow. What happened? Did Cody win the Fall Formal already?
[Cody shakes his head for no]
Rigby (EG): What happened to me earlier?
Garfield (EG): Ok, NOW not everybody.
[The Rainbooms nods]
Rigby (EG): I was under The Dazzlings and the Cyberlings spell. I guess Tino and Ryan are not immune to their singing.
Batman (The LEGO Movie): Maybe you need a rest, Rigby.
Rigby (EG): [in Crunch Bandicoot's voice] Yeah, think I'm leaking brain juice. Gonna lay down a while. Sleepy.
[Cody laughs and hugs Sunset]
Predaking (EG): Anyway, if only there was a way to reach Twilight and her friends. Maybe they can help us find a way to break the spell that the Dazzlings and the Cyberlings have casted upon our friends.
Cody Fairbrother: The portal. Let me have a go.
[Cody runs to the portal but bumps into it]
Human Rainbow Dash: That's just a demonstration of what I was going to say. That's not going to happen. The portal closed.
Cody Fairbrother: [dizzy with birds flying around his head] Now, step aside. Twilight is trying to interfere with my plans one to many times already! She needs to be dealt with.
Matau T. Monkey: That's funny, Cody.
[Cody shakes off the dizziness and birds land on Matau]
Matau T. Monkey: Hey!
Human Fluttershy: That's nice for the birds to land on your head, Matau.
Sunset Shimmer: Wow, Matau. You look so silly.
[Matau chuckles at the joke]
Human Rarity: Anyway. [clears throat] [gasps] [gasps again]
Rigby (EG): Am I still in a band, Matau?
Matau T. Monkey: Yes, Rigby. Take a picture to show Crash when he gets here.
[Rigby (EG) pulls out a camera and takes a photo of Matau]
Mordecai (EG): Maybe the Doom Raiders might join us for this musical showcase.
Predaking (EG): And I kind of get the feeling that they don't have cell phones in where Twilight and her friends are from.
Rigby (EG): If we have a book to read. At least I punched a demon girl while you and the others faced dark magic and really kicked it's bum. [to Cody and Sunset] Uh, no offence, guys.
Cody Fairbrother: None taken, Rigby.
Sunset Shimmer: I think I have a way that we can reach Twilight and her friends.
[Later, Cody pulls out a dusty book and blows on it]
Matau T. Monkey: Achoo!
Cody Fairbrother: Sorry.
Matau T. Monkey: It's ok. Tell me how Sunset have this book?
Cody Fairbrother: Well, when we are Princess Celestia's students, Sunset was given this book. Even when she abbadon her studies with me and leave Equestria, she hold onto it. I know she was wrong for me and her to become evil, I hope this works.
Cody Fairbrother: I hope this works when I write this. Just to be sure it's safe and I don't die or get captured by a winged female demon. [to Sunset] No offence.
Sunset Shimmer: None taken.
Cody Fairbrother: Sunset. May I borrow a pen? You and the others go and wait at the portal.
[She nods and hands him one]
Cody Fairbrother: Thanks.
Matau T. Monkey: Round them up and bring them to the portal.
[Sunset nods and they gather their friends and head to the portal. Cody sighs]
Cody Fairbrother:[opens the book] She haven't write anything for a long time. [starts writing] Dear.... Prince... Ryan.
[Cody starts writing on a blank page