They soon came over the ocean.

"...We gotta go under the sea?" Creepie asked.

"Hope ya brought your water wings!" called a reddish-skinned kid with blue eyes and four arms. "Dive, dive!"

"Huh...?" The others blinked.

"Come on, guys, let's go!" Akito and Estelle beamed before jumping in the water as their waists glowed and they now had tail fins.

"Merlin sent you, right?" The kid asked. "Well, follow me!"

LJ groaned. "Ooh...I feel weird..." his and Zofia's lower halves began glowing.

"Me too!" Zofia added.

"What the-What's going on?!" Creepie asked.

Suddenly, their legs turned into mermaid tails.

"Yeah, this is a thing that happens to us," Akito explained. "LJ and Zofia just recently discovered they could do it."

"H-How...?" Creepie asked.

"Queen Athena from Atlantica was our great-aunt," Estelle said. "We inherited her gene. Come on, let's go down to the sea!"

"Also, you might need some way to breathe down here." The Tetramand kid added.

"That's helpful..." Creepie said before taking out an empty fish bowl and wore it on her head.

They soon went down into the sea.

"I don't think I've seen you before." Estelle said to the kid who helped them out.

"Oh...I'm Ethan. My mom is Looma Red Wind, and my father is Sokka of the Southern Water Tribe!" The kid explained.

"Well, hi, Ethan," Akito said. "I'm Akito, this is my twin sister Estelle, and our cousins: LJ and Zofia, and that's Zofia's new friend, Creepie Creecher."

"Good to meet you," Estelle smiled to their new friend. "Your dad's Sokka, huh? I've heard a few stories about him."

"Yeah, Dad tells all about the adventures he had as a kid," Ethan replied. "And he was awesome!"

"Jumpin' jellyfish!" Sebastian cried out to himself in misfortune. "How do I get myself into these situations?"

"Um...hey Sebastian," LJ waved. "We're here. What's the sitch?"

Estelle giggled. "I love that catchphrase."

"Augh! Don't sneak up on me like that!" Sebastian yelped once he saw them. "Oh, I knew it had to be Ursula come back again. Look! She's gonna be trouble!" he then said, showing them a crystal ball.

"And here I thought we'd hafta face her craze-o sister again." LJ smirked.

"Oh, don't get me started on her or when Great-Aunt Saleen betrayed Mom, Dad, Aunt Cherry, and Uncle Lionel when she was working with Burger-Beard to ruin SpongeBob Squarepants." Akito replied.

"Whoof...I meant that time with Cousin Melody, but alright, that works too." LJ replied.

"Sorry... Just a little steamed about family betraying family..." Akito said. "Anyway... Uh, Sebastian, can you show us anything?"

"But of course." Sebastian replied.

Hades was soon at the River of Souls with the sea witch of Atlantica. "So, I'm asking myself, what is the fabulously wicked Ursula doing here in the River of Souls when she could be leading my invasion of the Magic Kingdom? You capture that land, and the Crystal of the Magic Kingdom for me, and I'll let you stay up there."

"Always the charmer." LJ remarked sarcastically.

We soon saw Ursula in her lair with her electric eels.

"Where's the fun in capturing anything if you don't get to rule over the poor unfortunate souls you swam over in the process?" Ursula smirked. "Besides, our hot headed friend's much too busy to realize I've double-crossed him before it's too late!" she then let out an evil laugh. "Tear down the sea wall, boys!"

"She's gonna flood the whole place!" Sebastian panicked.

"Then we have to plug up her plans!" Zofia replied.

"Sebastian's right, everyone. The entire land will be submerged!" Merlin told the others. "You've got to stop Ursula and make sure she doesn't get her hands on the Crystal of the Magic Kingdom. You must find this location next. Use your Sorcerer's Key again to access the portal and then, Sebastian will help you figure out what to do from there."

"Great... Now WE gotta deal with Ursula and we weren't even born then." Akito groaned slightly.

"Relax, guys," LJ replied. "This ain't gonna be a problem!"

"My brother is right, we've got Ursula to stop and the rest of the crystal to find." Zofia added.

They soon swam about under the sea with Creepie as she looked all around.

"I guess you were sent to help too?" Creepie asked Ethan.

"Sure was!" Ethan replied.

"Well, we could use some help," Akito smiled. "Plus it's nice to meet some new friends along the way."

"Really? Awesome!" Ethan grinned. "Let's get submerged!"

"Of course!" The others agreed to that.

"This is really weird... I kinda like it..." Creepie said to her new friends.

"Well, for us, weird is the new normal." LJ replied.

"Trust me, I know what you mean." Creepie smiled.

"I think we're gonna get along nicely!" LJ beamed.

Creepie nodded as they went to go up against Ursula the Sea Witch.

Akito and Estelle looked around before finding their cousin, Melody.

"Mel, you okay?" Estelle asked.

"I'm worried that Ursula's back," Melody frowned. "I was hoping I'd never meet her."

"Well, first time for everything." LJ replied.

"I guess so..." Melody frowned.

"Are you all okay down here?" Akito asked.

"We were visiting Grandpa Triton," Melody informed. "I think Ursula took my mom."

"Then we gotta help her!" Akito replied.

They soon swam off together.

"Hi!" Melody said to LJ and Zofia.

"Hi, Melody," Zofia said. "So glad you aren't hurt."

"Same too!" LJ agreed.

"I just hope that my mom is okay..." Melody frowned before gasping as she saw the old boat her mother used to visit with Flounder and Urchin.

"You okay, Melody?" Estelle asked.

"I... I thought I saw Ursula..." Melody said nervously.

"Keep on your guard, team." Ethan remarked.

They snuck over a bit to take a look near the shipwreck while staying quiet. Vaporeon soon came out and huddled to Melody, nuzzling her.

"Shh..." Melody told her Pokemon as she hugged him.

Ursula smirked as she soon got away, walking through a window and soon swam on as her eels, Flotsam and Jetsam came out.

"It's those creepy eels!" LJ remarked. "They're back, too!"

"Ursula's plan is working." Jetsam smirked.

"Soon the ocean will flood the castle." Flotsam smirked back.

"To create a new fortress." They both then told each other.

"Not a chance, jolt-heads!" Ethan remarked.

"I might have zero Pokemon," LJ added. "But it won't keep me from kicking your butts!"

"We can't allow any interference!" The electric eels replied and zapped them all with their own magic.

"Owch!" Creepie groaned before glaring. "I wish you hadn't done that!" She took out a card. "I summon: RIGHTEOUS STOMP!" she called as the card glowed with blue energy.

Flotsam and Jetsam looked around, feeling confused, until a cannon dropped right on top of them before exploding with a cannonball as it hit them flat on the deck.

"Oh, so loud..." Jetsam groaned before they both swam away.

"And quite heavy..." Flotsam added.

"You did it! There still may be time to stop the Sea Witch and the rising ocean!" Sebastian told them. "Alright, my friends, this is where you need to go next."

"Looks like it's go time!" Akito nodded. "See any 'Mons around here?"

LJ glanced around. "Shoot...bupkus. Zilch. Squadoo. Translation: NOTHIN'!" he replied.

"Don't worry, LJ, you just have to be patient." Melody coaxed as she carried her Vaporeon.

"Well...okay then." LJ replied.

They soon left to the next location after defeating Flotsam and Jetsam.

"Soon the water and the Sea Witch's dark magic will spill out and swallow the land!" Sebastian warned them.

"Thanks, Sebastian, we got it." Creepie replied.

"Now let's go unclog her scheme!" added Ethan as they headed off.

They soon found a castle as Ariel was held hostage.

"Mom!" Melody cried out.

"Oh, please help!" Ariel pleaded. "I-I can't get free. Won't someone please help me?!"

"Oh, dear. Don't worry Ariel!" Merlin said as he came to help the former mermaid princess. "I'll have you free in a moment. Hang on!"

"Leave it to me, big guy!" Ethan replied as he hopped over. "Us Tetramands are pretty strong folk!"

Akito looked over before shrugging. "Ah, what the heck?" he then smiled. "Go for it, Ethan!"

Ethan grabbed the block that was keeping Ariel pinned down and began pulling with all four of his arms.

"Hey, Ethan, buddy, we should wrestle sometime," Akito smirked. "You should meet my friends Rikochet, Buena Girl, and The Flea too, I'm sure they'd like to meet ya."

"That could be fun...I guess," Ethan remarked. "But this shelf seems to be really stubborn here."

Akito soon came over to Ethan to try to help him out.

"Don't worry, Mom! We'll have you free!" Ariel promised.

Vaporeon looked suspicious of Ariel on the other hand.

"What's up, Vaporeon?" asked Melody.

Vaporeon soon tried to tell her something.

"You don't think that's really Mom?" Melody asked. "Who else could it be? She's right here!"

"Maybe it's some kinda sixth sense." LJ replied.

"No! We've been following Ursula's magic!" Sebastian told the others. "So that can't be Ariel! It's a trick!"

"Melody, it's me, help Mom!" Ariel cried out.

Vaporeon soon growled, tensing up around Ariel like he hated her now, hitting her with a Hyper Beam.

"Whoa!" Ethan cried as he fell back.

"What?! Oh, my. Oh, goodness," Merlin soon panicked. "Then I need you to help me expose any charade by using the Sorcerer's Crest. Quickly! It's the symbol found on the back of your spell cards!"

The kids held up their cards. "SORCERER'S CREST!" they exclaimed.

Merlin soon used that and zapped Ariel while Melody freaked out because she believed that was her mother.

"No! What are you doing? Give me your hand. Oh, please!" Ariel cried out before her voice soon changed suddenly. "I'm just a helpless little mermaid!"

The others soon looked surprised as a tentacle emerged from the water.

"What could you possibly have to fear from little old me?" Ursula grinned as she soon came out from right behind Merlin.

"Zounds!" Ethan yelped, realizing he was holding a tentacle. "Looks like your Vaporeon was right!"

Ursula soon tried to grab Merlin with a tentacle, but luckily, he teleported away in time before seeing the others. "Oh, I'm just warming up, honey," she then smirked to them. "It's sink or swim time," she soon saw Melody. "Ah... This must be the new little mermaid..."

Ethan smacked the tentacles back. "Buzz off, octo-jerk or I'll tie ya in a knot!" he remarked.

"My, my... Such manners..." Ursula mocked.

The others glared at Ursula, especially Vaporeon as he growled at the sea witch.

"Let's turn this bad egg into calamari rolls!" Ethan remarked to the others.

"Oh, it appears that you poor, unfortunate souls don't know who you're dealing with." Ursula smirked before leaving.

"Get back here, ya coward!" Akito glared.

"That was close!" Sebastian gasped.

"Great work, everyone!" Merlin told them. "Since it appears I must attend to this little flooding problem, I need you to go after Ursula."

"You got it, boss man!" LJ nodded.

"Where was I? Jumpin' Jellyfish!" Sebastian gasped. "You need to go here and catch up to Ursula before it's too late!"

The others nodded and soon went that way after the crab told them so.

"I'm sorry I doubted you." Melody told her Pokemon.

Vaporeon nuzzled up against Melody to show that he accepted her apology. LJ glanced back at them, then took off in hot pursuit.

"Wait up!" Zofia told her brother.

But LJ was busy looking around for any Pokémon while checking out the scene. Eventually, the others caught up with him as they looked for Ursula.

They soon made it into Merlin's office where the sea witch was and she rummaged through the good wizard's things.

"Oh, no! The whole place is underwater! Be careful!" Sebastian told them.

When LJ looked around, there were many fish and other sea creatures, but also Water Pokemon like Starmies, Shellders, Horseas, and some Mudkips. One of the Mudkips soon saw LJ and swam up to him with a small smile.

"Hey, buddy," LJ smiled. "Nice to meet'cha!"

The Mudkip smiled to LJ, coming closer.

"Oh, that Mudkip seems to like you." Estelle smiled.

"Sweet!" LJ gushed.

"Well...?" Estelle smiled. "Aren't you gonna catch it?"

"Oh!" LJ realized as he took out a PokéBall and tossed it at the Mudkip.

Mudkip looked up and was soon put in the ball. It tried to wiggle a bit, but the ball soon sealed which meant that LJ had successfully captured Mudkip and some music seemed to play.

"...What's that music?" Estelle asked. "Feels like something out of a video game..."

"Whatever," LJ shrugged. "Let's kick some sea witch butt!"

Estelle smiled to LJ before they swam along together.

"Looks like you guys could use some back-up." LJ remarked as they arrived.

The others invited LJ and Estelle to come along.

"Knock-Knock. Is this thing on?" Hades asked as he appeared in the crystal ball. "Ursula?"

"Oh, hold your seahorses, big boy," Ursula said as she turned around to him while still looking for what she needed. "Hmm... Now where would he hide a magic Crystal?"

LJ cleared his throat. "You have business with US, Sea Witch."

"Listen, with all these interruptions how am I ever going to finish?" Ursula soon complained before glaring and zapping the group. "Maybe by first finishing you!"

"Yaugh! You can't do that!" Melody glared back. "Morgana might've been my enemy, but I won't let you ruin my grandfather and aunts' home!"

"What she said!" Ethan remarked.

"Vaporeon, use Hyper Beam!" Melody cried out.

Vaporeon glared and soon struck against Ursula with his attack.

Ursula grunted from that before glaring back. "Please, let's be reasonable." she then said before spraying them in a cloud of ink.

"Fishy Joe, time to cut through the cloud with a Water Gun!" LJ exclaimed as he sent out his new Mudkip.

The Mudkip soon attacked Ursula with the attack.

"Oh, good, it knows that move already." Akito said in relief for LJ's sake.

"Way to go, little hombré!" LJ whooped.

Mudkip smiled to LJ. Ursula was then suddenly gone and the castle was drained.

"Good work, my friends." Sebastian approved.

"Why is this crystal ball no longer in service?" Hades complained as he appeared in the crystal ball again.

"Another slam-bang victory wrenched from the jaws of despair!" Akito and Estelle whooped.

We soon cut to the moat where Ariel was celebrating the victory with her family in peace, including her father, King Triton, of course her husband Eric, their daughter Melody, a young boy with red hair who was Ariel and Eric's son, Caspian, and Ariel's sisters: Aquata, Andrina, Arista, Attina, Adella, and Alana, who looked happy to see their sister safe, especially their niece.

"You did it!" Ariel beamed as she did a flip. "You saved the day!"

"Never thought I'd meet an actual mermaid." Creepie commented.

"Same here!" Ethan agreed.

"However, I'm afraid Hades still finding villains to join his effort," Merlin said. "We could always use your help again."

"Ugh! Why won't he stop?!" Akito complained. "He's worse than Giovanni!"

"Then let's get movin' and keep on puttin' the kibosh om his ambitions!" Ethan remarked.

"You coming too, buddy?" Creepie asked the new guy.

"Sure am!" Ethan replied. "My parents would want me to!"

The others smiled to Ethan as he was a great friend so far.

Ariel and her family soon waved them off.

"Bye-Bye." Caspian smiled as he was carried in Eric's arm.

"Away we go!" LJ exclaimed.