This story is a sequel to Godzilla's Lost Child

It all started out when Godzilla awoke from the ice. He went towards the Crystal Empire and easily defeats the Mane Six, only to find out that Twilight Sparkle is his long-lost daughter. He wanted to put his rage behind him, put Equestria behind him, put everything behind him and his daughter.

It went typical from there, a new threat arrives, Twilight returns to Equestria with her friends, fights the threat, accepts her past and defeats it, achieving a hybrid form in the process. But this isn't the end of the story of Twilight Sparkle's adventures.

Three months after the events that led Twilight to accept who she is, and a new adventure begins as a mysterious island a little more than four times the size of Manehattan rises form the ocean waters a few miles southeast of the Dragon Island, one containing an even more mysterious city that was hidden under the sea for millions of years, one supposedly inhabited by the humans from the past.

Now, Twilight Sparkle had another adventure in hand, but this time, she's not alone. Follow her as she and her friends search for the city's ancient knowledge along with a mysterious griffon hermit before they fall into the hands of another evil set on world domination.