On the Volcano Island, Po and the Kids are reunited with Li, Grandma, Ping, Rooster, Wing, and Wong, and work together to find out what's really going on the island. Xiao becomes suspicious of some of her royal workers.

The gang learns of even bigger and direr forces working against the Empress and the Kingdom of China, and must come up with a plan to put a stop to it before it is too late.