About five years ago, a group of best friends were recruited as spies to defend Equestria but, while they were investigating the Dark Side of Equestria, they saw that this would become more than just a small mission, this would become a war.
After two years of the war against the evil Brax, the group of friends conquered Brax and sealed him away for good. Now, most of the friends are considered princes and princesses while the rest are helpers of them.