As the Mongols invade the Valley of Peace, Po and the Furious Five - Tigress (Tara Strong), Monkey (David Cross), Viper (Elsa Lanchester), Crane (James Hong), and Mantis (Fred Tatasciore) - must band together to stop Kai and his minions. With their combined kung fu skills and teamwork, they prepare to face off against the seemingly unbeatable Mongol horde.