The story begins with Rainbow Dash and Scootaloo are watching a prank call video in the library in CHS. Watching their prank call idol known as the, "Master of Laughs".
In the video, an old woman's cell phone rings and she picks it up.
"Hello?"
"Oh, yes, this is I-fell tower." (Almost sounded like, "Eiffel tower)
"I-fell tower who?"
"I-fell-tower she-fell tower!" Then Rainbow and Scoots laughed at his prank call. "Oh, yeah! You just got pranked by the master of laughs!"
"Isn't Pinkie Pie the master of laughs?" Scootaloo asked.
"Well she represents the element of laughter." Rainbow Dash replied.
"The Master of Laughs is the funniest thing on the internet, right, Dash?"
"I guess he's pretty funny. But you know what's even funnier than watching prank phone call videos?" She held out her phone from her pocket.
Scootaloo gasped. "Wait! You don't mean…?"
"Oh, I mean it, scoots."
Then the girls rushed to the girl's restroom with Rainbow Dash locking the door and Scootaloo made sure that one other than them was inside.
Rainbow Dash begins to dial Pinkie Pie's number. Pinkie Pie was at the soccer field, doing the "Pinkie Pie way," but stopped when her phone rang and answered the call.
"Hello?"
"Hello, Pinkie Pie."
Rainbow Dash and Scootaloo started to snicker.
"Do you know anything about cupcake guy?"
"Ooh! Is he coming?! Is he coming?!"
"Yes. Just hold on for a collect from…Cupcake guy!"
Sci-Twi is doing some chemical experiment inside the chemistry lab until her phone picks it up.
"Hey, Twi, do you have any friends named; four-eye wonder?"
"Excuse me?"
Rainbow and Scoots laughed again. Sci-Twi hangs up with an angry look on her face.
Cuts to Principal Celestia's office where she was doing her computer work, and her phone rang and picked it up.
"Hello?"
"Hey, Principal Celestia, you got any books by Yo dada?!"
"Who is this?!"
The two girls laughed at their hardest while Celestia's voice was heard through the phone.
"Whoever you are, I will find you and you'll be serving a whole month of suspension with extra homework!"
"She's still on the phone!" Rainbow laughed.
"She's still on the phone?!"
"She's still on the phone!" Then they laughed like never before and then Rainbow hangs up.
"Oh, Dash, we're the best prank callers ever, aren't we?"
"Yeah, second best." Rainbow Dash replied.
"What? Did you not hear what we just did? We were hilarious!"
"Yeah, we were. But that's just the beginning. There's this someone we haven't prank call on."
Scootaloo gasped. "You don't mean him. Do you?"
"That's right, scoots. Let's do this."
Then they heard someone unlocking the restroom door and it revealed to be none other than Principal Celestia. Giving the two girls a stern glare making them gulp.
"My. Office. Now."
The girls were inside her office with Vice Principal Luna. Principal Celestia shook her head and sigh.
"Look, Principal Celestia, we're really sorry." Rainbow said.
"Yeah, we're just joking." Scootaloo said.
"Well, prank calling a Principal of this school is an offense to this. So instead of giving you two a whole month of suspension and extra homework, you two will be given a week of suspension." Celestia said. "And your suspension starts once the final bell rings. You two are dismissed."
"And before you go," VP Luna added. "We also confiscated your phones so none of you will prank call anyone again. And you'll have them back by the time your suspension is over."
When the girls exit the office, Scootaloo groaned.
"Well how do we suppose to prank the master of laughs, now?"
"Well, let's ask Pinkie Pie for a phone." Rainbow suggested.
Then they found Pinkie Pie on the soccer field still untouched while holding her phone. Believing she's receiving a collect call from, "Cupcake guy."
"Hey, Pie, can we borrow your phone?"
"Oh I would but I'm holding to talk with Cupcake Guy!" Pinkie Pie replied.
"Oh. Well, Pinkie, the truth is we-"
"You can use some phones Twilight had in her locker!"
"Okay. Come on, scoots. Let's go."
Then they found Sci-Twi who's still doing her chemistry experiment in the chemistry room.
"Oh. Hey guys." Sci-Twi said, not amused.
"Hey, Sparkle. Look, if you're angry, then we're sorry about that."
Sci-Twi sighed. "It's fine. So, what are you guys doing here?"
"We would like to use some phones you had in your locker. Like Pinkie Pie tells us about." Scootaloo replied.
"Okay. Here are my keys to my locker." She then throws her locker keys to Rainbow Dash.
"Thanks, Twilight. Catch you later!"
She and Scootaloo rushed away from the room. They went to Sci-Twi's locker with Scoots unlocking it with Sci-Twi's keys and saw two old cell phones.
"We hit the jackpot! 70's cellphones are perfect!" Rainbow asked.
"How are a few decades old phones going to help us?"
"Think about it, Scoots. With these babies, no one will ever track us down with their phones!"
"Cool."
"Now C'mon, let's prank the Master of Laughs."
The girls went to the park and wore tinfoil on their heads. "Okay," Scootaloo said. "Let's do this."
"Alright, here we go!"
Then Rainbow Dash dialed the number, and the Master of Laughs picked it up.
"Hello?"
"Yeah, this is, uh, the pizza delivery guy." Rainbow Dash said. "I have 50 pizzas you ordered."
"Sounds great. Bring them over."
"Uh, you ordered 50 pizzas?"
"Yeah, and hot wings. Get here quick, okay? Your mom's totally starving."
"Yeah, uh, I got to go." She hung up.
"You need to do better than that, Dash. I got this." Scoots said. Dialing his number and phone rings again.
"Hello?"
"Hi." Scootaloo said in idiotic voice. "This is john."
"John who?"
"Uh…John…Johninson…?"
"Your name is John Johninson?"
"Uh…yep."
"Well, congrats. That's the stupidest fake name I've ever heard. And what happened to your unfunny fake voice?"
Scootaloo said nothing but went silent.
"Now listen up, stop calling here or I'm going to make you sorry!" Then the MOL hangs up the phone.
"This guy is good. I don't know scoots. I don't think we should do this."
"Oh C'mon, Dash. We got to prank this guy! Do you want to be this guy's daughter, or do you want to be a winner?"
"Okay. Let's do it." She then dials the phone. "Hey, Master of Laughs, this is…"
"Get it." He hung up.
Scootaloo dials the number. "Hey, this is-"
"Heard it." He hangs up again.
RD dials the number again.
"Yeah, hello…"
"Do you get anything original?" He hung up.
"That's it!" Scootaloo dials it again. "It's time to put an end to this junk fest!"
But he hung up.
"Looks like the junk fest got a new number." Rainbow said.
"Yeah right, like your 50 pizzas thing was way better!"
"Whatever, John Johninson, john."
Then the phone suddenly rings.
"Pff, nice try, scoots. I know it's you."
"Uh…it's not me, Dash."
She picks it up and they both listen.
"Is this the Pizza Guy or John Johninson?"
"Uh… both."
"I warned you to leave me alone. Now I'm gonna prank you so hard, you'll be pranked out of your twits! The 1970's called: "They want their cell phones back!"
Then they are sucked into the phones and tumbling through the vortex of phone cables in space with year numbers floating around. Then, they found themselves where before they started to prank call him.
"Where are we?"
"Scoots, I think we're back in the park."
"Are we?"
"What do you mean?"
"Dash, all the trees are short, and look at the park bench, it's so new looking. I'm telling you, something's not right here." Scootaloo said.
"How can you tell?"
"Well…" She then noticed a familiar figure. "Hey, that's Apple Bloom's granny, let's go ask her."
The girls walked up to Granny Smith, who's facing in the opposite direction.
"Hey Mrs. Smith. Can please tell Scoots that everything is fine."
"What now?" Then Granny Smith turns around and appears to be much younger. The girls are shocked to see this.
"Why does Granny Smith look so young?" She whispered to her.
"Now then, who are two young women? How do you know my name?"
"Smith. It’s us! Rainbow Dash and Scootaloo."
"But I've never met any of you in my entire life."
"Okay, Scoots. You got a point. Something is going on around here."
"That's not the only thing. Look!" She then points to their surroundings that are 1970s related and such. "We're in the 70's Dash! Mrs. Smith, what year is this?"
"Why, it's 1978, of course." Granny Smith replied.
"See?"
"Scoots, this is bad."
"I know. I don't even like the 70's that much!"
"The only way we're going back is that we prank him harder than he pranks us!"
"Let's do it."
Rainbow Dash dials the phone.
"Hello?"
"The 60's called, they want their-"
"What did I tell you about calling me?!" A bright yellow sparkling cloud comes out of the phone and it morphs into a giant 1970's cell phone with arms and legs. "You couldn't leave me alone. Now you're gonna pay!"
"Hey look, let's not make this go out of control."
"It's too late for that, Rainbow punk!"
"Rainbow Dash?"
"Yeah scoots?"
"Can we run for our lives, now?"
"As much as I'd have to keep you away from danger, let's roll."
The girls began running away from him. Rainbow Dash decided it's not the time to use her super speed since she doesn't want to leave Scootaloo behind. The Master of Laughs is still chasing them and the phone rings and Scootaloo answers. "Hello?"
"The 70's called: They still need more!"
Then their clothes suddenly switched with 70's clothes.
"This sucks!" Rainbow complained. "These clothes are not even cool anymore!"
"How would you know?" Scootaloo argued. "We're not even born yet!"
"Rarity knows a ton of 70's clothing style! It's boring when she's talking about them!"
The phone rings again and Scootaloo picks it up. "Look, we'll do whatever you want! Please leave us alone!"
"Don't ever hang up on me!"
More clothes appeared on the girls and their hairstyle changed. "Scoots!" Rainbow panicked. "Call somebody to help prank this guy!"
"Like who?!"
"Just call somebody!"
Back in the present, the girls were at the park and the 70's phone rang. Pinkie Pie picks it up and answers.
"Hello?"
Pinkie, you gotta help us, we're stuck in the 70s!"
"Who are you talking to?" Sci-Twi asked.
"It's Rainbow Dash and Scootaloo. They're stuck in the 1970s." Pinkie replied.
"Oh, really?" She takes the phone from Pinkie Pie. "Hello?"
"Twilight, we need your help! We're stuck in 1978!"
Sci-Twi was not amused. "Very funny Rainbow Dash."
"Oh man, she thinks we're messing with her!"
"What gives me that?!" She takes the phone from her hands. "The 70's called, they want their cell phones back!"
Then the Equestria Girls are sucked into the phone and later appear to be running with the two girls.
"Rainbow Dash, Scootaloo what in tarnation is going on?!" Applejack asked.
"And why are you two wearing those?" Rarity asked. "They're so out-of-fashion."
"No time to explain!" Rainbow Dash replied.
Then a truck pulled over and it turns out to be young Granny Smith, driving it. "Need a right?"
"Hold on a minute. It's that Granny Smith?" AJ asked.
"No time! Hop in!"
The girls quickly get inside with Rainbow and scoots ride shotgun. And Granny Smith stepped on the gas harder to make a quick getaway.
"Okay. We need your help to prank the Master of Laughs!"
"Who?"
"Why did you prank him?" Fluttershy asked.
"And he does sound like a 2nd Pinkie Pie." Sunset said. But then realized what she just said. "No offense, Pinkie."
"None taken." Pinkie said. "But that title stealer is still going to get it for stealing my title!"
The phone rings and Sci-Twi picks it up.
"I'll take care of this." She answers the call. "Hello?"
"Nice ride… But mine is better."
The Master of Laughs summons a limousine, and he is catching up to them.
"Ah' got no time to get chased by a darn limousine again!" Applejack shouted. "Lose him, Granny!"
"Hold on tight, ya'll! This ride is getting bumpy!" Granny Smith shouted.
"Uhh, has this reminded you all the last time you gave us a road trip?" Sunset asked.
"Yes." Rainbow replied.
Granny Smith stepped on the gas, and went into the grass, shortcuts and offroads in hopes of losing him. After they lost sight of him, they stopped by the 70's electronic store.
"Ah' bet we lose him." Applejack said. "How are we supposed to deal with him?"
"I got an idea." Rainbow Dash said.
The girls are back to the park with Rainbow Dash setting up the phone and answering machine on the field and they hide separately.
"Ya' better be sure this works, Rainbow Dash." AJ said.
"It will work, AJ. Trust me. All part of the plan."
Young Granny Smith turned her attention to Applejack. "You seem not too bad. Oh, I wish I could have a granddaughter like you."
"Oh ah' have a strong feeling you will, Granny Smith. Me, Big Mac and Apple Bloom." Applejack said.
The phone rings. The tape recorder turns on with only Rainbow Dash's voice can be heard. "Hello?"
"This is the Master of Laughs telling you-"
"Hello?"
"I said this is the Master of Laughs!"
"Hello, hello, are you there?"
The Master of Laughs appears next to the phone. "I SAID-"But then he realized that he had been psyched.
"Ha, ha! Just kidding. You just got pranked, loser!"
"NOOOOOOO!"
"Now!"
Then the Equestria Girls pinned him down hard enough for him unable to escape their hold.
"Scootaloo hit the power button!"
"Who's the best Master of Laughs now, jerk-dish?!" She climbs up and presses the power button.
Then the Master of Laughs shuts down and becomes lifeless.
"Now who's the Master of Laughs now, you loser?!" Both Rainbow and Scoots said. But I realized what they just said. "No offense, Pinkie Pie."
"Eh, none taken. But we should all know that the Master of Laughs is me!" Pinkie Pie said.
Then the light shines from the Master of Laughs' speaker. "Hey guys, this could be the way back."
"Wait. That was it?" They turn around and see Young Granny Smith standing there. "Well I guess this is goodbye. I really hope to see you all again."
"Oh you'll see us all in the future." Applejack said.
They wave goodbye and it is about time that the girls went inside the speaker. They're inside a hallway with doors that each have a different year on them.
"One of these doors leads us back to the present."
Sci-Twi noticed on the door that says, 2020. "There it is."
When the rest of the girls went through the door, the true identity of the Master of Laughs attracted Rainbow and Scootalo's attention.
"Wait." The Master of Laughs turns out to be an undead-looking man. "You girls were better than me today, but you can't leave me here. All I ever wanted to do is to make prank calls like you. Was that so wrong?"
"What do you think scoots?"
"I don't know, Rainbow Dash. He tried to kill us."
"Yes. But Sunset turned into a demon but we defeated her and we forgave her, Sci-Twi turned into one as well until Sunset changed her back and forgave her. So, he just got his just desserts but it's time to do the same. Forgiveness is friendship." Rainbow Dash said.
Cut to Sunset's house as she is sitting on her couch playing video games. Her phone rang and she picked it up after she paused the game.
"Hello?"
"1, 2, 3! The 70s called: "They want their couch back!" Then Sunset's couch disappeared. Rainbow Dash, Scootaloo and the Master of Laughs are seen laughing outside of Rainbow's house.
THE END