Agara (TV series)

Agara is an American-Japanese animated Kaiju series that airs on Nickelodeon.

Synopsis
Many years ago during the Feudal period of Japan, a race of aliens hid a giant monster named Agara until he was needed for war. Years later, an evil alien named Zarakon plans to takeover the Earth with an army of monsters, Agara awakens from his hibernation to save the planet.