"You're the airbender?" growled the furious-looking firebending stranger, shock and astonishment written all over his face. "You're the Avatar?"

"No way," muttered Sokka, but even as he said it he realized he was wrong. Aang – this funny, bald kid they'd barely met – couldn't even be a teenager yet, but Sokka had seen amazing things from him. He'd been frozen in a block of ice, had already proved a very proficient airbender – and the smile was gone from his face, replaced with a look of intense determination.

And, watching the stare-down, Sokka realized that Aang was hiding some pretty incredible secrets.