You had lived on the surface for years after not being able to find a burrow to live with human kind underground. The days of modern mankind are long gone, maybe it was 200 years ago? you read it in a history book when you lived in your burrow before it was destroyed and all the humans were traded to Scarlamagne.
You built a mercenary group of the humans you found on the surface, you'd go around pillaging and making the best of the situation. But slowly more and more members got picked off by things like Mob Frogs, Timber cats, mutes and just anything that wanted to kill you or enslave you.
You evaded death and enslavement for so long until it was finally your turn. Your found family was all gone, either eaten or sold to Scarlamagne, brainwashed into his court.
The brainwashed human "nobles" weren't enough to hold you down so now you're being dragged by two huge primates into a ball room, the place looks ripped right out of a history book about the French bourgeoisie. Hypnotized humans dancing with masks and noble clothes and primates singing, all wore probably lead make up.
At the center, atop a podium, sat a huge mandrill with nobleman clothes. He played the piano furiously, laughing like a mad man.
Eventually he stops and along with him, his subjects stop as well. "Seems like one of you incompetent peasants caught the rogue mercenary. Lord, you look just as animalistic and brutish as I imagined."