Vilius Unleashed

Vilius Unleashed is the thirteenth episode of Tenkai Knights. It first aired on November 16, 2013 on Cartoon Network in the United States.

Plot
While Ceylan and Toxsa are still battling in the Dragon's Nest, Guren and Chooki bring the White Key to Quarton with the help of Boreas. Once there, the five Cubes are combined into one giant cube that can be only opened with the White Dragon Key, awakening the Tenkai Dragon. Once awakened, the boys learn how to command the dragon and use its might to turn the tide of battle against the Corrupted. However, Dromus captures it in a trap and transports it to the Corrupted headquarters. During the fight, Guren reveals his human identity to Vilius before beating him. In the aftermath of the battle, Vilius revives and swears to conquer Quarton and Earth.

In the episode

 * Dromus captures the Tenkai Dragon in this episode, which is a big factor in other episodes.
 * It is revealed that Vilius can revive himself.
 * Vilius learns more about Earth and that the new Knights hail from there.
 * This is the last episode for "Shunkan Diamond" to be the Japanese ending theme.