In Mordecai and Rigby's bedroom, Muscle Man and Hi Five Ghost are taping Mordecai's bed to the ceiling. "I can't wait to see the look on Mordecai's face when he finds his bed on the ceiling. He'll be like, "Oh no, where am I gonna sleep tonight?" He and Hi Five Ghost laugh. "Best prank ever!" HFG and Muscle high five each other; Pops comes in, chasing a balloon. "Hahaha! I've got you this time, balloon." Pops touches the balloon, causing it to hit the bed; the tape rips and Mordecai's bed crashes down on Pops, leaving Muscle Man and Hi Five Ghost shocked. He whimpers.

"Oh no, bro!" Pops begins to cry loudly and Benson and the others come into the room. "Pops!" Benson said. Skips gets the mattress off of Pops who is severely injured. "Call an ambulance, now!" Mordecai rushes to call an ambulance while (Y/n), Rigby, Skips and Benson comfort Pops. "It's gonna be okay, Pops." (Y/n) said. Pops is still sobbing in pain as Muscle Man looks upset and guilty, traumatized upon seeing what he has done. Everyone is now outside where two paramedics are carrying a groaning, bandaged up Pops on a stretcher with a blanket over him.

"He should be fine in a few days, but he's definitely lucky to be alive. That bed could've killed him." The words 'killed him' echo in Muscle Man's head, making him feel worried; he runs to Pops. "Pops! Pops! Pops, I'm so sorry, bro! It was an accident!" He shouted. "No worries, I'll be quite alright." Pops said. "No, Pops, I almost killed you, all because of my stupid prank. I swear from this day forward I will never prank again. Ever." Muscle Man said. "Okay. That's enough."

Pops moans in agony as the paramedics load him into the ambulance and drive away into the distance; Muscle Man looks guilty as he trudges away slowly in shame, while (Y/n), Mordecai, Rigby, Skips, and Benson look on. "Muscle Man, where are you going?" (Y/n) asked worriedly. "Away, bro. I'm done with pranking forever." As Muscle Man rounds the hill, the others try to comprehend what just happened. "All right! No more pranks from Muscle Man! Up high!" Rigby raises his hand to high-five. "No Rigby, this is bad. We've got a huge problem on our hands now that Muscle Man has given up pranking." (Y/n) said uneasily. "What are you talking about?" Mordecai asked. "She's right. Believe it or not, Muscle Man's pranks saved this park a long time ago." Benson said.

~Flashback~

The park was a battlefield; pairs of underpants are on leaning flagpoles and toilet paper strewn across flaming log cabins.. "It was under siege and almost destroyed in a prank war with a rival park..." A walking stick with the rival park, East Pines, flag on it (yellow background with a green pine tree on it) suddenly slams down on a whoopee cushion, releasing a farting sound effect. Gene holds the walking stick. "They were led by their manager, Gene... " Benson said. "AAAAHAHAHAHAHA!!!" A huge background explosion occurs.

Toilet paper rolls soar across the smoky sky as Gene's ranger troops fire water balloon blasters at Pop's house which is mostly destroyed and within it, a younger (Y/n), Benson and Skips are in the battlefield with helmets and armor cowering behind a jagged wall. "That's it, we're done for!" Benson shouted, (Y/n) whimpered and clung onto him fearfully. "At least, I thought we were done for..." behind the house, Hi Five Ghost and Muscle Man, with a "#1 Prankster" bandana around his head, are examining Gene's army through binoculars. "It's not over until I say it's over!" Muscle Man then pulls a lever, triggering a catapult to launch a gigantic green water balloon labeled "MY MOM" across the Park and into the East Pines park, smashing into the trees and flooding the entire park. "NOOOOOOOOOOOOOOOOOOOOOOOOO!" Gene shouted.

(Flashback ends)

"So Muscle Man became the ultimate weapon in ending the prank war. With him gone, there's no telling what will happen." Benson said. "C'mon Benson, do you seriously think that guy Gene is gonna hold a grudge for that long?" Mordecai asked. No sooner do these words leave Mordercai's mouth, a water balloon suddenly appears out of nowhere and hits Benson in the face, and everyone was surprised. Just then, a bunch of water balloons are being shot into the park; everyone runs into the house, screaming, and Benson closes the door.

"See, the prank war is not over! We have to win it, or we're all gonna die." (Y/n) said. Later in Skips' garage, everyone, minus Muscle Man and Pops, are having a meeting. "OK listen up, we're getting seriously pranked out there. We can't win this without Muscle Man, so I'm gonna convince him to come out of retirement. In the meantime, you guys need to buy us some time. (Y/n), Mordecai, Rigby, what do you got for me?" Benson asked.

"We're gonna take out their bathrooms." Mordecai said. "We've got jumbo rolls of plastic wrap." Rigby said. "Sounds promising. Skips, Hi Five Ghost." Benson said. "We got expired baloney, illegal fireworks, and three good arms." Skips said. Skips and HFG high five each other. "Good. Good. Just remember, we're dealing with pros out there so keep your eyes open. Now get out there and make this park proud." The park workers open the garage door, and Gene and two of his

groundskeepers pull up in a East Pines van. "Oh, hey Benson, I hear Muscle Man retired from pranking. That's a real shame. Light em' up boys!" Gene said. "Look out!" (Y/n) shouted. East Pines park employees start shooting tomatoes at the guys. "Back in the garage! Back in the garage!" Benson shouted. They close the garage door. "What do we do?!" Rigby panicked. "Hi Five Ghost and I will draw their fire! Just get Muscle Man back!" HFG phases through the garage while Skips breaks through the window and run away.

"There they are, go go go!" HFG and Skips head towards East Pines, while the East Pines van follows behind. "(Y/n), Mordecai and Rigby, head to the other park and get into pranking position. I'll call you with further instructions." Benson said. "But what are you gonna do?" Mordecai asked. "'I'm going to get Muscle Man back." Benson said. Inside Muscle Man's trailer, Muscle Man is sitting on his couch and is putting his '#1 Prankster' bandanna and other pranking items into a box and stares at nothing; Benson comes into the trailer. "Muscle Man, the rival park is pranking us again. We need you!" Benson said. "You got the wrong man, I don't do that anymore." Muscle Man said. "But we're getting destroyed!" Benson shouted. "Maybe I didn't make myself clear. I don't prank anymore." Muscle Man said.

"I can't believe this! You're just gonna let them destroy the park?!" Benson shouted. "Whoa! Back up bro! I almost killed a man. A park, that's just land. You can replace that any day of the week, but a man's life, that's forever." Muscle Man said. "But the park i-" Benson said. "It's over, Benson. I'm done." Muscle Man said. Benson sighs. "Thanks for nothing!" Benson leaves the trailer, and leaves Muscle Man sitting in the dark. Meanwhile

(Y/n), Mordecai and Rigby are hiding in a bush nearby. "(Y/n), Mordecai, Rigby! Muscle Man's out. We're gonna have to stop this ourselves." Benson said. "Let's do this." (Y/n) said. (Y/n), Mordecai and Rigby head towards the restrooms and go into one of the restrooms but they get ambushed. In another location in East Pines, Skips and HFG are hiding in a bush nearby. "Skips! Come in Skips!" Benson said. "Yeah Skips here." Skips said. "I lost (Y/n), Mordecai and Rigby, you and HFG still good to go?" Benson asked. "We're on it!" Skips takes out the bologna, yells, and charges towards the rival members, throwing bologna everywhere,

while HFG lights up the fireworks, throws it into the building, and the fireworks explode and the groundskeepers run out and Skips is hit by tomatoes. "I'm hit!" At Pops' house, which is now covered in tomatoes; Benson is inside the house. "Skips! Come in Skips!" He shouted. "There's too many of 'em!" Skips screams; Benson screams and takes off his hat in anger and frustration. "Benson! Come in Benson!" Mordecai said. "Mordecai! Where are you guys?!" Benson shouted. "Right here!" (Y/n), Mordecai and Rigby are outside, tarred and feathered.

"(Y/n), Mordecai! Rigby! Get out of there now!" The trio are hit by tomatoes. "NO!" (Y/n), Mordecai and Rigby kneel in defeat as they are hit repeatedly by the East Pines groundskeepers and Benson goes outside rescuing (Y/n), Mordecai and Rigby and helps them stand up. "We gotta get out of here! Their pranks are too good!" Mordecai said. A truck filled with whoopie cushions drives toward them and the driver flips the truck to the side which creates a sonic boom that throws

(Y/n), Mordecai, Rigby, and Benson into trees, destroys the trees and portions of the house; (Y/n), Mordecai, Rigby, and Benson gasp in shock, then the van pulls up with its door pulled back, revealing Gene who is holding marbles. "Hey guys! You lost your marbles?!" Gene throws the marbles which causes (Y/n), Mordecai, Rigby, and Benson to slip and fall to the ground and he laughs. "Say good bye to your park, 'cause when we're done with it, there'll be nothing left!" 3 trucks full of whoopie cushions are flipped over, which knocks down more trees.

"We gotta get outta here! Somebody's gonna get hurt or killed." Rigby said. "I've got an idea, just hold on." Benson gets into the cart and drives away. Inside Muscle Man's trailer, he's sitting on his couch and a knock is heard. "What?" He asked. Benson rolls Pops in with a wheelchair. "Ooohhh." Pops said. "Pops, shouldn't you be in the hospital?" Muscle Man asked in shock. "Well, yes, but there are worse things going on right now. You need to start pranking again." Pops said. "No way, Pops! I almost killed you! I might almost kill again."

Muscle Man said, guilt-ridden and adamantly. "But only your pranks can save the park." Pops said. "I can't do it, Pops." Muscle Man looks out the window to see the East Pines groundskeepers shooting whoopie cushions at the fountain, throwing toilet paper into the trees, dropping pies from air planes onto the Park, and putting purple drink mix into the pond. "Their pranks aren't hurting anyone, my pranks can kill. I won't do it." Muscle Man said. "Then we've lost the war." Pops takes out a gift. "At least the rival park was kind enough to send me get well confectioneries."

Pops opens the box, a boxing glove punches Pops in the face which causes him to fall off his wheelchair. "Pops!" The duo shouted. "Their pranks are hurting me!!" He starts crying. This was the last straw for Muscle Man. "This prank war ends now!" Muscle Man shoves stuff off the box full of pranking items; gets his '#1 Prankster' bandana on, puts black combat boots on, and puts war paint on his face. "If I don't make it back, tell my mom I died doing what I love.

Whooo!" Muscle Man swings his shirt up in the air and runs outside. "I think we just won the war." Benson said. Gene laughs. "Victory is as good as ours. Soon that park will be reduced to rubble!" The monitors show a truck full of whoopie cushions flipping over which knocks down trees; pies landing onto the ground, and the groundskeepers throwing toilet paper onto a statue of Pops;

They laugh until they get pulled away and the other monitors show other groundskeepers being pulled away as well. "What the-?" The groundskeepers scream as they get pulled away and Muscle Man's face appears on all the monitors. He gasps as the ceiling light falls down the map; Muscle Man's face pops up. "Muscle Man?!" He asked. "The pranking ends now Gene, give up or else." He said. Gene laughs. "Give up? I'm not giving up until I see your park completely destroyed!" He said. "Fine, you asked for it bro." The room starts to shake as the building launches into space. "Muscle Man, what's going on?" Gene asked. "We're in outer space, bro. Looks like we won't be needing these walls." The walls break up; Gene screams as he is being pulled towards the sun, but first, he goes through a two-headed lizard.

Muscle Man appears on the sun. "There's no way of knowing where we're going. I think the danger must be growing. What's that warm light a glowing? Oh no, bro! It's the sun, it's set in motion! Get ready for some fun! Hope you brought your sun tan lotion!" Muscle Man laughs as his head becomes a skull. Gene screams. "Okay, okay, I'll never prank your park again, I swear, I'll stop!" Gene screams and falls onto the floor, revealing that all of it was fake and Muscle Man stands nearby. "Huh? What? How did you do that?" Gene asked. "Easy. Mirrors, you idiot."

Outside, 4 tall mirrors stand around the building. "Oldest prank in the book." The tall mirrors then collapse. "So no more pranking, right?" Muscle Man asked, and Gene groans in defeat. "Right." He said. "And you're gonna clean up all the damage you did to the Park with your lame pranks." Muscle Man said sternly. "What? No way." Gene said. "Want me to bust out the mirrors again?" Muscle Man asked threateningly. "No, no. We'll clean, we'll clean." Gene said.

The Park and the East Pines groundskeepers are now cleaning up. "It looks like we can finally put this prank war behind us. You all made this park proud today, especially you, Muscle Man. We couldn't have done it without you." Benson said. "Yeah, thanks a lot for that, Muscle Man." (Y/n) said. "Duh, bro. I'm best pranker there is! No one can stop me, I'm never retiring!" He swings his shirt in the air. "Whhhhooooooooooo!!!!" He runs away. "Whhhooo!!" He shouted. "Alright Pops, back to the hospital." Benson said. "Later Pops." Mordecai said. "Get well soon, Pops." (Y/n) said. "I will." Pops said. Pops laughs as Benson starts wheeling Pops away and looks back at the others. "Thanks Pops, the park really owes you for faking that boxing glove prank. I knew Muscle Man would only have pranked Gene if you pretended to be hurt." Benson said. "Oh, it's quite alright. It was a jolly good show." Pops laughs.