After a group of pegasi stumble into the borders of the Griffin Kingdom as an attempt to start a war by assassinating the Griffin King,The Immortals, a group of 6 humans with abnormal powers (And,of course, Immortality) are called upon to defend Equestria, will the Immortals keep Equestria and her equines safe? or will they fail and give into the Griffins? Only time will tell...
The Immortals are not based on anybody or anything, they are fictional.