Everyone is groaning in the house on a hot summer day. "Okay, that's it." Muscle Man takes off his pants. "C'mon Muscle Man! Not the pants." Mordecai said. "If I don't take them off, I can't cool 'em off. Simple science, bro." Muscle Man said. "Listen up, due to the extreme heat, the park is closed today, work is cancelled. If you need me, I'll be in the shade lying still." Benson walks away. "Alright. Did you hear that, Mordecai? A day off." Rigby said. "Too bad we don't have air conditioning, and it's too hot to move." Mordecai said. "Oh yeah. Man, this day off is a scam." Rigby said, and Y/N snickers.

"We just have to find a place where we can cool off." Mordecai said. "And where would that be, Mordecai?" Y/N asked. Later, the trio is at the coffee shop. "So just the free ice water then?" Elieen asked. "Yeah, thanks Eileen." Rigby cools himself off with the ice water. Eileen stares at Rigby, wide eyed. "Feel better now?" She clears her voice. "Feel better now, Rigby?" She asked. "No, I'm still hot." Eileen takes the shirt. "Mordecai and the Rigbys? Whatever happened to that?" Elieen asked. "We had to break up. Didn't want to end up as British dirtbags, so." Mordecai said. "Wait, what?" Y/N asked in confusion.

"It's a long story." Rigby said. "That's why I quit Mole Scouts too. Well anyway, if you feel like getting back together, there's a Battle of the Bands here tonight." Elieen said. "Nah, that was a different time." Mordecai said. "Yeah, things have changed for us." Rigby said. "First prize is an air conditioner." Mordecai and Rigby gasp, and Y/N's eyes widen. "Guys, you should totally do it." Y/N said. "Where's the sign up sheet?" Mordecai asked. At the park, Benson holds up a soda to cool himself off, Skips sits on a hammock,

Pops laying on a chair with a fan to cool himself off, Muscle Man and Hi-Five Ghost laying down on a pool, and Thomas is laying down on another chair. "Hey guys, guess what?" Y/N asked, and they all groan. "There's gonna be a Battle of the Bands tonight." Mordecai said. "Why should we care, bro?" Muscle Man asked. "Because the prize is a brand new air conditioner!" Y/N said, and the guys got excited. "And we're getting the band back together." Rigby said. Mordecai and Rigby are mimicking rock stars who are playing guitars. "Mordecai and the Rigbys aren't a band. Two guys who can barely play guitar isn't a band." Benson said. "Hey, we've been practicing." Mordecai said. "But on your second point, you're right, two guys isn't a band. That's why we need you guys." Rigby said. "Yeah. Pops, keys." Y/N said. "Skips, bass." Rigby said. "Muscle Man and Fives, horn." Mordecai said.

Mordecai and Rigby are mimicking drummers. "Benson on drums. And..." Mordecai and Rigby look at the two goats. "Uhhh..." Mordecai said. "I know, we can be your British managers." Thomas said, and the trio looked confused. "What?" Y/N asked. "Dude, every band has a mean British manager." He speaks with a British accent. "Oi, you lot!" He snickers and again speaks in a British accent. "We're supposed to play Manchester on half an hour ago!" Y/N also snickers. "Sure... if that's what you want. But can't I just like... sing or something?" Y/N asked. Mordecai and Rigby look at each other, then shrug. "Sure, if that's what you want." Mordecai said.

"Oh you guys won't be disappointed. Y/N has a great voice." Thomas said. The duo look surprised, then smirk. Y/N blushed a little at the compliment, and so did Thomas once he realized what he said. "I mean, uh... have fun!" Thomas runs off. "Uhh...sure, man. So, you guys with us?" Mordecai asked the others. "If it means getting out of this heat wave, then we're in!" Muscle Man said. "AC! AC! AC! AC!" Everyone chanted. "You guys better know what you're doing!" Benson said. In the garage, the gang is setting up the band and playing music. "Guys? Guys?" Mordecai asked. "Hey, listen up you lot, Mordo here has something to say!" Thomas said, then leaves, and Y/N chuckles.

"Uhhh...thanks, Thomas. Now we're all in this together and we all have equal say. No one person is in charge, okay?" Mordecai asked. "Fine! Even though I've actually been in a successful band before." Benson said. "Really?" Y/N asked, sounding a little surprised. "Yes." Benson said. "Okay, we need a really awesome tune. Anybody have any song ideas?" Rigby asked. "I'm working on a rock opera! It's a little thing I call: Benson-Phonia!" Benson said. "Benson, no offense but since we're equals now, that sounds totally stupid, bro. No offense!" Muscle Man said, and Y/N snickers. "Actually, I've been working on a riff." Mordecai said. "Let's hear it!" Pops said. "Yeah, share." Y/N said. "Okay, I'm a bit rusty, alright? Okay, okay." Mordecai plays a guitar riff, and then the rest of the band plays along with it one at a time. "C'mon, Mordo!" Mordecai and Rigby play a short riff.

♪ Sometimes I dream about that AC, AC! Cold waves blowin' over, over me. Feelin' hot maybe it's a state of mind, Think cold to pass the, pass the time! Snowman and, snowstorms, ♪

"Stop, stop, stop! Again! One and-a two and-a three and-a four," Benson and the band play in unison. Benson points at Muscle Man. "You're not blowing hard enough! I mean, really blow!" He turns to High Five Ghost. "And as for.." Later, Benson is on the drums. "You're flat! You're flat!" Benson said. Y/N groaned. Benson plays the keyboard to Pops. "See how much better that sounds?" Benson takes a listen to Skips on the bass. "Skips, you gotta play on tempo!" He said. The band plays but is interrupted. "Again!" The band plays but is interrupted again. "Again!" The band is interrupted for the third time. "AGAIN, AGAIN, AGAIN!" Benson shouted. Later the group is having a secret meeting in a bathroom except for Benson.

"Sorry for the weird meeting place, but Benson only allowed one bathroom break and we got some urgent business to take care of. Now, I'm gonna say what everybody else is thinking. We gotta do something about Benson, right?" Mordecai asked. "Oh defiantly." Y/N agreed. "He told me my bass playing was sloppy. Me, Skips!" Skips shouted. "He told me my arpeggios don't arpeggi-flow! What does that even mean?" Pops asked. "At this rate, we're never gonna win that AC! And the Battle of the Bands is in a few hours!" Rigby said. "Who thinks me, Y/N and Rigby should run rehearsals?" Mordecai asked, and everybody raises their hands. Rigby flushes the toilet. "Meeting adjourned!" Benson is seen outside of the stalls listening angrily to what they're speaking about. "Alright! Good meet—" Mordecai screams as he sees Benson. "I came to check up on you guys. I'm the only one taking this seriously and you BACKSTAB ME LIKE THIS?!!?!!" Benson asked furiously.

"Uhh..." Y/N said nervously. "WELL, I QUIT!!!!!!" Benson throws the drumsticks on the ground. "Good riddance!! And don't come back!" Mordecai shouted. Benson slams the door shut. "But Mordecai, what do we do now? We need a drummer." Y/N said. "One, two, three-" Thomas said, as the group is later doing a rehearsal. The band plays badly. "Oh boy." Y/N said. "Hey, hey guys! I think we're gotta scrap Keepin' It Cool." They all groan. "It'll be okay, though! I've been working on a new sound that the judges are gonna go nuts for. Okay, so it starts off with a child voice saying: You can't tell me what to do! And then it goes:" Mordecai is playing the guitar, singing. ♪ Used to be a time when you had all the power! But these days, it's more like you are just a jerk! ♪

"Mordecai!" Rigby said. "♪ And I don't wanna look at your face! ♪" Mordecai continued. "MORDECAI!" Rigby shouted. "What?" He asked. "What?!" He asked. "Listen to yourself! This is not a good song!" Rigby shouted. "Oh, yeah?" Mordecai grabs Rigby. "Then how come this is the song that's gonna take us to the top?!" He asked. "Ahh!" Rigby pounds on his fists. "Get off of me!" He shouted. "Woah, woah! Cool it!" The band breaks them up. "You've lost it dude!" Rigby snapped. "Good!" Mordecai spits angrily. "I didn't want it anyway. I quit!" Then Mordecai and the rest of the band leave, except for Y/N. Rigby sighs and then puts down his guitar.

"You okay, Rigby?" Y/N asked. "I don't know, Y/N. I mean all I wanted to do is win the air conditioner. And now Mordecai and the Rigbys is dead -- again." Rigby said. "Yeah, but if anyone can get the band back together, it's you." Y/N said. "Me? Why me?" Rigby asked. "You're the one who came up with the band in the first place. You're the one who kept wearing the t-shirt way after it was cool. You're the one who can keep the band alive." Y/N said. "Hey, yeah! I can get the band back together! And all I gotta do is lie and say I got free pizza! Come on!" Rigby said. Mordecai enters the room. "Don't get any ideas. I'm just here to eat my free pizza and go." Benson also enters the room, and they both scoff.

Y/N closes the door. "Y/N?!" They asked. "What's going on here?" Benson asked. "Yeah where's the free pizza?" Muscle Man asked. "Okay, look, don't be mad. But there's no free pizza." Rigby said. "I'm out!" Mordecai said, but Rigby blocks the door. "But there's a good reason I brought you all here! We can work this out guys, we can still win!" Rigby said. "No way, dude! I'm not playing in a band with Benson!" Mordecai slaps Benson's drum kit. "Don't touch my kit, Mordecai." Benson said. "Or what?" Mordecai asked. "Or..." Benson grabs Mordecai's guitar.

"Or I'll cut your strings!" Mordecai slaps Benson's drum kit again. "Guys, stop!" Y/N shouted, but they ignored her, and it ended up in a fight and destroying all their instruments. Thomas comes back. "Oy! Just wanted to make sure-" he was surprised at what he saw. "Krikey." Thomas said. "Oh man, what are we doing?" Mordecai asked. "Yeah, we just broke a bunch of stuff!" Rigby said. "I guess I'll never go triple platinum with this baby." Muscle Man spills soda from his trumpet, and everybody laughs. "Ha! I can't believe we let the heat get to us like this. I'm sorry I quit, dude." Mordecai said. "It's okay, man. This stuff happens when you're in a band." Rigby said. "Yeah, but I forgot what was most important." Mordecai said. "Friendship?" Y/N asked. "The air conditioner. You're right though! We can still win this thing." Mordecai said. "Okay, except that was something he said before we broke all our instruments." Y/N said.

"No! We can still do it! When you're in Mordecai and the Rigbys, the music's inside of you. But we need everybody if we're gonna win. Even the ones we thought were acting like jerks, but are actually pretty good drummers." Benson was touched and grabs Mordecai's hand. Later on stage, performers are playing their songs. The crowd boos at them and the judges rated them "Not Cool". "Next!" A judge said. "What happened back there?" Elieen asked Thomas. "Ah, all the instruments are destroyed." He replied. "What?!" Elieen asked. Mordecai and the Rigbys show up on stage. "There they are!" They pretend to put their guitars onto them.

"Hey! Where are your instruments, man?" A man asked. "Shut it!" Y/N snapped. "We are Mordecai and the Rigbys!" Mordecai and Rigby said. "And we rock so hard, we don't need instruments." Y/N said, and Thomas had to cover his mouth to keep himself from laughing. "Hit it!" Rigby said. "A-one, a-two, a-one, two, three, four!" Mordecai, Rigby and the rest of the band do an acapella mimicking the sound of their instruments. Eileen and Thomas were shocked. "Sometimes I dream about ice planted eggs, by distant planet way colder, colder than the rest. That's where Lord Blizzord resides, think about His kingdom to pass the, pass the time. Ice mix and Ice can. There's not much into it," Then they glow and virtual instruments started to appear. "K-k-k-keeping it cool! K-k-k-keeping it cool!" Rigby plays while laying on the ground.

"Wooh! Alright, yeah!" Elieen and Thomas said. "Man, they sure look gross and sweaty." The band keeps playing their imaginary instruments. "K-k-k-keeping it cool!" The judges rate them: "Cool". "K-k-k-keeping it cool!" They play until there's a large text above them that says: Keeping it Cool. Then Lord Blizzord gets out of the air conditioner. "Lord Blizzord!" Lord Blizzord blows a blizzard onto them. In the hospital, Mordecai and the rest of the band was there. "Huh? We won!" Mordecai said. "Actually, you guys collapsed of heat stroke before you even started." Eileen said.

(Flashbacks to what really happened on the stage.)

"We don't even need instruments!" Y/N said. "One, two, three!" Benson collapses. Mordecai and Rigby mimic the sounds shortly and also collapse. The crowd boos at them and the judges then rate them: "Not Cool"

(Present)

" You actually got last place. Your subconscious must have created a reality where you're really good. You're in a hospital now." Elieen said. "Are you alright, Y/N?" Thomas asked with concern. "Yeah... just got a headache." She said. "How long was I out?" She asked. "A couple of hours." Thomas said. "But dude, free AC!" Rigby said. "Woaaahhhh!" Then they shiver because of cold. "It's freezing in here!" Y/N said. "Can we get some --- extra blankets?" Mordecai asked.