Prompt 48: 'Radioactive' by Imagine Dragons

Long ago, the four nations lived together in harmony. Everything changed when the fire nation attacked.

Sure, Terran had heard the legend time and time again in his travels. He'd even heard of a boy named Aang who was supposedly the Avatar - heard of his great deeds and childish demeanor, and some tidbits of his companions. He even watched a play in one of the fire nation villages, though he didn't see the appeal of the characters.

But the Avatar was to begin a revolution against the tyranny of the fire nation. Terran would back him up, definitely. If he ever found the Avatar, he'd join him. He'd fight alongside him. Bring victory, free the peoples! It would be a glorious war.

All he had to do was check out of prison.