The Equestrian Flood

The heroes must now explore the oceans of Equestria as it has been heavily affected by overflows of water, as people like Seaquestria, Equantica, and many other underwater civilizations, have been feeling a dark presence in the ocean, and it's not Squirk as they previously thought. Turns out, it's far worse: a monster capable of massive floods known as a Leviathan, in it's traditional form as a giant fish beast, had been released from it's Tartarus Prison, and has gone into the oceans and causing water levels to rise. They have to now not only stop the Leviathan, but find whoever released it. They later find who did it: another relative of the Storm King called The Typhoon King, whose powers of manipulating water are 'unfathomable' in his words, as he has used the Leviathan to avenge his family by flooding all of whoever caused them to crumble in the first place. Thus, the heroes must do what they can to stop this flood from destroying Equestria and drowning everypony in it, and have to do it with a curse inflicted on them by Typhoon King that keeps them from using magic or other forms to breath underwater, hopefully through some help in the form of ponies like Paradise and her sister Paradise Island, the two heads of a resort island for everyone in the world of Equestria called Atlantia. As they continue to try and keep the ocean from going insane thanks to Typhoon, they travel to new underwater cities beyond their comprehension, and with help from Paradise's merpony husband Summer Streak and his two adopted siblings and couple Haven Bay and Salina Blue, and even discover that Novo's guard captain Sir Ripple has a crush on her adopted daughter and Abysswish's daughter Princess Swellsea, as they traverse the mysteries of the Equestrian world's global oceans, facing danger and obstacles in order to find a power strong enough to keep Equestria from being flooded, and find it in the form of a group of seaponies called Pure Seaponies, who have been so bonded to the magic of Princess Maricolous, they can wield magic without the use of a relic and have been spread out but rarely seen, and lead in Ocequestria by a royal seapony and Abysswish's cousin named Wavedancer and her sisters Seawinkle and Sealight.

Meeting the Pure Seaponies
Equestrian Sea
 * Twilight: (Following the failed attempt to stop Typhoon King, the air-breathing heroes are seen sinking silently underwater as the sea-breathing heroes were struggling to save them)... (Twilight fell unconscious with bubbles escaping her mouth, and everything faded into black)
 * SpongeBob: TWILIGHT, HOLD IT IN!!! WE'RE GONNA MAKE IT!!... SOMEBODY HELP US!!!... SOMEPONY HELP US!!!... (Suddenly, something gave them bubble helmets as they gasped)
 * Twilight... Wha... What?
 * Skystar: (Cursed into a hippogriff with her mother)... What's happening?
 * Novo:... I recognize this magic reading!... It's-
 * ???: Do not worry, otherworldly heroes! We are here for you! (Magic auras were seen surrounding the entire group as a familiar accursed G1 lyric was heard)
 * Icky:... Oh, God, no! PLEASE?! I THOUGHT WE WERE BETTER THEN THIS?! FOR THE LOVE OF CHIRST, PLEASE DO NOT- (Different-appearing seaponies with more vibrant appearances came and sung this)
 * Icky: "(SCREAMS LIKE A HIGH-PITCHED GIRL AS THE SONG WENT ON?!)..... (Grabs Pervis by the mouth and puts his head in it) PERVIS, PLEASE CRUSH MY SKULL IN?! I DON'T WANNA LISTEN TO THIIIIIIIIIIIIIIIS?!"
 * Novo:... You... You're the pure seaponies who are one with the magic of Princess Maricolous!
 * Pure Seapony #1: You got it! And we would LOVE to offer our help of saving those who are out of breath!
 * Pure Seapony #2: In fact, we took care of the drowning ponies of Equestria for you! (They were seen rescuing them and loading them on whales acting as boats)...
 * Skystar:... Thanks! Geez, that Typhoon King can hit like a tsunami! (The seaponies gasped)
 * Pure Seapony #1: THE Typhoon King?!? THE ONE WHOSE RESPONSIBLE FOR THINGS LIKE THIS?!?
 * Pure Seapony #3: Well, saw that coming! He's been at this more often since 2017! Clearly SOMETHING must've pissed him off.
 * Twilight:... Weeeeelllll... We may've disrupted his family name when we beat their ultimate conqueror, Storm King!
 * Lord Shen: "Along with several other family members that either tried to avenged him, or became a threat because of going after our friends, or just because we encountered them by stupid chance!"
 * Pure Seapony #2:... Well... I guess you look like you can handle this. And like we said, if you need us, just send an SOS! We've got a LOT on our plate!
 * Icky: Well, PLEASE, don't torture us with that accursed G1 song!
 * Cynder:... I gotta be honest, it's not as bad as people make it out to be. Nice tune, really.
 * Icky: BLASPHEMY!!! I'D TOSS HOLY WATER AT YOU IF WE WEREN'T ALREADY IN WATER!?
 * Pure Seapony #1: I, uh, wouldn't move so roughly if I were you. Those bubble helmets ARE easy to pop.
 * Icky:... Well, you got a way for us to fight down here, flippers?
 * Missing Link: Uh, guys? Look down! (They noticed their van below)...
 * Sandy:... Well, I'll be damned! That van is a monster to survive a flooding like THIS! Let's kick it, Lodgers! (They entered the van, which flooded with water as they opened it, and they piloted it upward)
 * Pure Seapony #4: Good luck out there, heroes! (They magically teleported away in magical bubbles)...
 * Icky:... I don't know how... But I feel I need to boil my brain!
 * Fu-Xi: "I'LL GOT GET MY HOT OIL SET!" (They went to the surface and unloaded all the water out)
 * Pinkie: (Gasped heavily and extendedly)... YES! AIR! AT LONG LAST, SWEET AIR!!! IF I COULD KISS YOU, I COULD!!!... IN FACT, I'LL TRY! (He does so)
 * Merlin:... Well... I guess water-breathing magic won't be on our side thanks to Typhoon King's stupid curses!
 * Chaos: Hey, at least we can STILL use other kinds of magic! Besides, you gotta thank these unexpected friends for saving us the hassle. (Pure seaponies were seen retrieving ponies, giving them CPR, healing injuries, and being downright friendly)... Same can't be said for... For their homes. (All of Equestria was seen submerged)
 * Pinkie: Well, we CAN make lemons our of lemonade, I mean, as much as we can given the danger, but nevertheless! I'm sure many of us here like a little dip!
 * Patrick: Oh, so we can dip food in water? I NEVER KNEW THAT!... (An aggravated Squidward pushed him into the water) DWOOP!!! *SPLASH*
 * Skipper:... Really?
 * Squidward: SOMEONE had to do it! Now, shut up, go diving for dummies, and let's get onto stopping Typhoon!
 * Iago: "Wow, someone's abit grouchier then normal today."

Welcome to Ocequestria
(Sorry about the edit conflict. I placed these two chapters here to get around things like that.)

Transcript
Coming soon...