Tenkai Knights

Tenkai Knights (テンカイナイト) is a Canadian-Japanese mecha anime series co-produced by Shogakukan-Shueisha Productions and Spin Master, with animation by Bones and Shogakukan Music & Digital Entertainment. It premiered on Cartoon Network in the United States on August 24, 2013, and on TV Tokyo in Japan on April 5, 2014. The story is set on a cube-like planet called Quarton, inhabited by shape-shifting robots called Tenkai. Quarton was ravaged by a war between the Corekai Soldiers, led by Commander Beagle, and the Corrupted Army, led by the villainous Lord Vilius. Four legendary Tenkai Knights (Bravenwolf, Tributon, Valorn, and Lydendor) rose to defeat Vilius. Years later, four teenagers from Earth - Guren, Ceylan, Toxsa, and Chooki - discover an interdimensional portal to Quarton and are chosen as the new generation of Tenkai Knights to stop Vilius from controlling both worlds.