Gary, Tucker, Lilo, Stitch and Betty Ann were enjoying themselves looking at clouds when Pinkie Pie rushed in with some exciting news, "I'm throwing a birthday party for Spongebob Squarepants!"

"I remember dreaming about him." Lilo recalled, "What day is his birthday again Pinkie?"

"July 14th," Pinkie said, "That's today!"

"How do you know Spongebob?" Tucker asked.

"She's a friend of Ariel," Pinkie answered.

"That means we're gonna have to go underwater." Lilo said.

"Me not like water!" Stitch shouted.

"We know Stitch," "But you can go to that All You Can Eat buffet in Ponyville."

"Yummy!" Stitch shouted.

Later, they explained everything to the others. C3PO was too terrified of Sharks and R2D2 decided to stay with him to make sure he doesn't worry too much. Twilight casts a spell on the gang, "This spell can make you guys breath underwater." Twilight said.

"Thank you Twilight," Gary replied,

"There are other spells," Twilight said, "But I'll work on them later."

"It's PARTY! TIME!" Pinkie shouted.

"I'm with you there Pinkie!" Tucker shouted.

"SUPER DUPER-" Pinkie Pie shouted.

"TUCKER PINKIE PIE" Tucker shouted.

"PINBALL POWER!" they both shouted.

"Not that guys!" Gary shouted.

"I hope this doesn't ruin the party," Gary whispers to Betty Ann.

Later, they were in Bikini Bottom. A squirrel named, "Sandy Cheeks" explained that the party is held at the arcade called, "The Party Cube".

Inside the place was divided into 5 areas. Koopa's Seaside Soiree, Boo's Haunted house, Toad's Midway Madness, Shy Guy's Jungle Jam and Goomba's Greedy Gala. They decided to start off at Koopa's Seaside Soiree.

Squidward recalled Spongebob remodeling The Krusty Krab into Western, Disco, and Space themed. It horrified him.

Betty Ann got an idea. She said her element name and changed their outfits into the Tropical theme so they can fit in. Rarity recalled the outfits from their adventure with the Wiki Tiki.

"Bet told me that it's the same time where you met Stella and her friends," Sam recalled.

"Of course," Stella said.

"Let's go to the beach," Tweety said.

There they took off for Koopa's Seaside Soiree.