In a very alternate timeline in Equestria, the Krang discover Equestria and make their headquarters in Manehattan. Four young ninja ponies have tried stopping the krang again and again, until one faithful night, they were unable to stop the mutagen bomb on time and Manehattan was ground zero. But it was so powerful that the bomb spread throughout Equestria. But by this time period and the lack of harmony, ponies were very much prepared for such an event so those who were able to escape, went underground or in other words, stables. But at ground zero, many ponies and creatures obliterated to the bomb, but others mutated. Leo was able to save his brothers by pushing them off a building and getting saved by the rubble, but Leo was right at the site of the blast and got covered in mutagen, upon being covered, he mutates and turns into a monstrous version of himself, who addresses himself as Maximus Kong. But here, this is Leo in the process of the mutation and he's in a lot of pain as the mutagen affects his genetics and changes from the inside out.