Estelle, Eloise, and Felicity laughed as they enjoyed their swim together as mermaids.

"Nothing could ruin this moment!" Estelle smiled.

"How are you liking this mermaid thing, Eloise?" Felicity asked.

"So much fun!" Eloise giggled as they swam around.

Princess Nebula was returning, then came to the three other mermaids. "Hi, Estelle! Hi, Felicity!"

"Hi, Princess Nebula, how have you been?" Estelle smiled.

"I've been perfectly lovely, thank you, I've missed you guys," Estelle said, then noticed Eloise. "And who do we have here?"

"Why, hello, my name is Eloise." Eloise smiled.

Princess Nebula smiled to that. "Princess Nebula."

"You're a princess?" Eloise asked in surprise.

"Oh, yes," Princess Nebula smiled. "You might become a princess yourself someday, you never know."

"I feel like a princess everyday at home." Eloise smiled back.

"I can tell." Princess Nebula smiled.

"How'd you guys meet?" Eloise asked.

"Oh, funny story," Estelle said. "We went on summer vacation after our first term with the Loonatics and they wanted to meet our parents and we went on this boat ride all together, but there was this evil dolphin named Adolpho..."

"Yeah and where his heart was corrupted." Princess Nebula said.

"Corrupted?" Eloise asked.

"Controlled." Princess Nebula, Felicity, and Estelle explained.

"Oh." Eloise understood now.

Estelle then suddenly felt an evil presence.

"Can you do this?" Princess Nebula asked her friends before she swam quickly up to the surface, did a flip as she was in the air, then splashed back down back over to them with a joyful smile and laugh.

"Ooh, nice one, right, Estelle?" Eloise asked her cousin.

Felicity applauded. Estelle looked very zoned out. The others then called Estelle's name. Estelle's eyes widened, she shut them and shook her head, then looked to the others.

"You okay?" Princess Nebula asked. "You kinda zoned out."

"S-Sorry, but we really have to go now," Estelle said before she saw a familiar figure swimming towards them. "And by now, I really do mean Now."

"What is wrong, Estelle?" Felicity asked.

"Yeah, you're acting weird..." Eloise added.

"He's back and by he, I mean Vincent and he's bigger than before." Estelle said.

"Vincent!" Eloise and Felicity got nervous.

Princess Nebula looked confused and curious why they were afraid of Vincent, after all, he was Estelle's brother, and one of her new friends outside of the kingdom...

"Princess Nebula, I know this may seem a bit confusing, but swim away from Vincent, he's been corrupted," Estelle warned her. "So swim, swim as fast as you can."

Princess Nebula had more questions, but she swam away like Estelle said. The four mermaid children swam as fast as they could through the ocean floor before they could get caught. And where they swam away just in time.

"Looks like they still remember the last time they saw me." Vincent said.

'You'll show them...' Captain Pollution's voice told him. 'Both of you...'

Jenny was by Vincent's side and had her own mermaid tail fin which was a powder blue color.

"Go and join them, my love." Vincent said evilly.

Jenny grinned evilly and swam quickly after Felicity, Estelle, Eloise, and Princess Nebula.

After she swam after the four mermaids, Vincent then disappeared.

"I haven't swam this fast in all my life!" Princess Nebula yelped.

"I think we lost him." Estelle said.

"What exactly happened with Vincent?" Princess Nebula asked.

"He's being controlled by a big meany." Eloise firmly narrowed her eyes and folded her arms.

"Yeah and that big meany's name is Captain Pollution." Estelle said.

"Oh, not pollution again." Princess Nebula pouted.

"I know, right?" Felicity asked.

They hid behind one of the caves. Jenny's eyes darted around as she looked for who Vincent said to go after. Seeing Jenny caused Estelle, Felicity, and Eloise to sigh out of relief.

"Oh, Jenny, it's just you..." Estelle was the most relieved, being closer to Jenny than the others.

"A friend of yours?" Princess Nebula asked.

"She's my pen pal," Estelle explained. "We used to write letters to each other until we met on her eighth birthday."

"Uh, did you guys share mermaid magic with Jenny?" Felicity asked, noticing that the girl had her own tail fin.

"Oh, yes, I found a magic potion when I was escaping Vincent and it gave me the ability to turn into a mermaid." Jenny told them.

"Really?" Eloise asked.

"Oh, yes," Jenny smiled. "I'm so happy to see you all."

"Well, it's great that you're not corrupted." Estelle smiled.

"Yes..." Jenny said back as her eyes seemed to flash briefly.

Felicity could had sworn she saw that, but no one said anything, so she kept it to herself for now.

"We're so sorry about Vincent by the way." Eloise then said.

"It's okay... I promise I'll be fine." Jenny told them.

"Well, then we better get back to the others." Estelle said.

"Aww..." Princess Nebula pouted. "It was fun to see you again though."

"Yeah, it really was," Estelle smiled. "I really wanted a swim today."

"Well, I'm glad you did." Princess Nebula smiled.

Estelle hugged her mermaid princess friend. "Be good."

"Always am." Princess Nebula hugged them back.

After they separated from the hug, Estelle, Eloise, Felictiy, and Jenny all swam back to the others. Princess Nebula then swam off back home to her kingdom.

"Everyone is going to be so relieved to see you back safe and sound." Eloise smiled.

"Come on, I'll take us to the surface." Estelle said since she led them into there.

"Lead the way." Jenny said.

Estelle nodded, then did just that.

"Nice to see you as a mermaid, Jennivere." Felicity smiled at the redheaded girl.

"Thanks, Felicity, and I must say, you're getting better at speaking English." Jenny said.

"Oh, merci beaucop," Felicity smiled. "I think being with the Loonatics has helped a little."

"I agree." Jenny said.

Estelle took them back up to the surface.

Once they were on the surface, Estelle, Jenny, and Eloise's tail fins disappeared and turned back into their legs. Felicity then took off her necklace and put her boots back on once the same happened to her.

"Let's see if Tech, Akito, Uncle Planet, and Zadavia are back from the concert yet." Estelle said.

"I hope they had fun." Felicity said.

"Yeah, same here." Eloise added.

Jenny followed after them to get to the Loonatics Tower. And where they saw Akito, Tech, Captain Planet, and Zadavia there.