We all know that the Legion of Doom have been turned to stone after being defeated by the whole of Equestria. We also know that Grogar was Discord in disguise and it is now back to a legend. Although, he was never only a legend. It was all real. He had managed to come back and retrieve the bell, thanks to the three villains for getting it out of the magical barrier. Will the mane six be able to stop him, or will they be infected of the 'useless' virus from the former princesses of Equestria?

https://www.deviantart.com/aleximusprime/art/They-can-t-stay-encased-in-stone-forever-821281597