Lilo, Stitch, and the rest of the Celestian Alliance were in the Mushroom Kingdom for an emergency.

Mario, Luigi, Donkey and Diddy Kong, Yoshi, Toad, Toadette, Princess Peach, Princess Daisy, and Rosalina were in the middle arguing about something.

Our heroes didn't know what to do.

Suddenly, Cresselia came down explaining what's going on. "They all want to be claimed superstar," explained the magical guardian, "but they all can't seem to make up their minds about it."

Lilo decided to straighten this mess out. "Listen, guys," she said. "There's always a better way than fighting and arguing. Otherwise you'll keep bothering the townsfolk's."

"You're right," Princess Peach replied. "I don't want my loyal subjects to think their ruler is a monster."

Everyone thought so hard on what they should do, then Mario got it. "I've got an idea!" he shouted. "Let's throw a party!"

"Did somebody say party?!" shouted Pinkie. "I've got my party cannon with me!"

"Oh, my," Fluttershy said. "Pinkie is at it again."

"I know," Rainbow Dash replied. "Pinkie gets this every time someone says the 'P' word."

"That's Pinkie's trigger word," explained Tucker. "Whenever someone says 'party', she always gets excited and goes crazy."

They had to calm down Pinkie Pie first. Pinkie was going around the fields blowing balloons, tossing presents with cupcakes inside, and blowing noisemakers. "Pinkie," shouted Poe, "calm down!"

"I can't, Poe!" shouted Pinkie. "I love PARTIES!"

"Pinkie," shouted Finn, "we don't want to break public property!"

"I say we punch her in the -" Iago shouted

"NO!" shouted Rey. "Star is present." Then she and Tucker got an idea.

Laughter

Generosity

They made diamond-studded balloons that attracted Pinkie. "That will calm her down for now," said Tucker.

Tucker and Star high-fived each other. Star then made a star-studded balloon just for her and she gave one to Rarity. "Thank you, Star," Rarity replied.

"Let Toad and Toadette be the judges for the competition," suggested Rey. "They always support Prince Peach."

After they divided into teams, Mario came to the front. "Is everyone excited as we are?" she asked with a big smile.

"YEAH!" everyone shouted.

"Good!" Mario shouted. "Here-a we go!"

In the Party Plaza, they saw five different portals to five different dimensions. They were ready to go.