Counting Upon The Seaponies

After the CMC's underwater adventure, their new hippogriff friend discovers clues of a secret power being sought by a threat named Squirk, and these clues can only be solved by the true seaponies of the Maricolous Ocean, Equestria's biggest ocean. Thus the longlost Flashstone must be kept out of Squirk's tentacles. However, there is a matter of why Squirk is even after that since he doesn't have Abyssmalwish anymore. But then it's discovered that Squirk is now working with another even worser sea-threat, Zeaweed, another Tartarus escapee and a creature made of pure seaweed known as an impure kelpie. Zeaweed wants the flashstone so she can make Seaweed Sentient in a bid to create an army of revenge against all herbavore socities that eat seaweed, the sea ponies espeically, which explains Squirk's involvement to a T. Now it's up to the Lougers and the Mane 7, and perhaps even the CMC if need be, to put both these underwater horrors in their place in Tartarus!