"Prelude to Ruin: The Threat of the Sphere Field Cannon!" is the sixty-eighth episode of the Yu-Gi-Oh! ZEXAL anime. It first aired in Japan on August 20, 2012.

Dr. Faker, using the power of the "Numbers" plans to destroy the Astral World with the Sphere Field Cannon. As Yuma and Astral suffer inside the Sphere Field, Shark, Tori, Kite and Orbital 7 try to save them and Hart as well. They are, however, confronted by Mr. Heartland.

YUGIOH ZEXAL 68 SUB FILE 

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