On stage Kendall is tuning his guitar. James is practicing his dance moves and Logan is looking at the set list of songs. When he suddenly hears an unusual noise behind him then jumps at someone saying Boo!

Carlos! "He says annoyed and hears laughing*

You're so easy to get Logie! "Carlos says" It's hilarious! *Laughs even harder*

Logan sighs and goes back to focusing on the set list*

Kendall: You're not mad at him are you?

Logan: No but he's testing his luck

Kendall just laughs agreeing with him and refocuses on his guitar*

Gustavo: Ok dogs time to rehearse the dance for Nothing Even Matters. Get in position. Ready and go

The music starts. Halfway through the song the fog machines turn on then an unpleasant smell fills the room and they stop dancing and start coughing*

James: What is that awful smell?

Velma and Logan: Formaldehyde

confused* James: Formal the what?

Logan: We'll explain in the dressing room. Come on *They all run backstage and into the dressing room*

Velma: Formaldehyde is a strong smelling colorless chemical that's flammable but it's used in household products and building materials

Logan: Inhaling that stuff can be hazardous to our health

Kendall: Why would it just suddenly appear during our rehearsal?

Logan: I don't know that is odd

Fred: Does this stuff usually happen at your concerts?

James: Nope

Daphne: Is it gonna get cancelled?

Carlos: Gustavo wouldn't do that unless he absolutely HAS to

Shaggy: Like what should we do dudes?

Kendall: We keep getting ready for the show from backstage. For now we'll make sure all our wardrobe for the songs are in order

Logan: Good idea Kenny. Hey Velma wanna see the cool pyrotechnics I have planned for the end of the show? I could use your scientific input on it

Velma: Sure Logan. I would be very happy to assist

30 minutes go by their wardrobe check is done. He's returning from the bathroom and hears the same moaning sound he heard earlier then the lights flicker. He runs back to the room panting*

You ok there buddy? "Kendall says"

Logan: No! The lights in the hallway were flickering and I heard that sound again that Carlos scared me with earlier

Wasn't me this time "Carlos says" Maybe the electricity is being weird cuz this building is haunted

Don't be ridiculous this building isn't haunted "Logan says"

After 30 more minutes it's safe to return to the stage but Scooby starts growling then whimpers and runs away to Shaggy*

Scooby: R-R-Raggy! Rhost, Rhost!

Shaggy: Like Scooby not now. You just ate

Scooby: No not roast food! Rhost boo!

Shaggy: Scooby will you please stop being so paranoid in front of Big Time Rush? There is no ghost

Says who?! "A deep voice yells at them and they look up to suspicious looking spirit floating above them"

Ahhhh! The building is haunted! "They both scream"

Logan looks up and sighs* Enough with the spooky pranks Carlos. Take that stupid costume off and get down from that platform

Uh..Logie I'm standing right here. "Carlos says as he munches on an apple"

Wait if you're right there then WHOSE THAT? "Logan says looking at the ghost"

Your worst nightmare Logan Mitchell! I'm coming for you! I'm getting my revenge tonight! "The ghost says then blows him literally off feet and down to the floor and vanishes"

Dude are you ok?! "Kendall says worried and helps him up"

W-W-What just happened?! How did he know my name?! That can't be a real ghost! They don't exist! There's science behind that! There's actual facts! This is crazy! "Logan says"

Fred: Well gang….

Shaggy: No Freddy don't say it! Don't say it

Fred: Looks like we have a mystery on our hands

Shaggy: Ahhh he said it Scooby!

Scooby: Ruh-roh!

Fred: We're gonna help Big Time Rush solve their ghost problem and save their concert

Gets startled cuz Daphne is squealing in excitement*