TITLE:"Turnaround Countdown! The Counter-Measure is Astral!?" is the fourth episode of the Yu-Gi-Oh! ZEXAL anime.
DESCRIPTION:Yuma challenges Professor Ukyo, who is behind it all. Professor Ukyo notes that each time he reduces his opponent's Life Points with "Electronic Computer-Beast Tera Byte" Astral's body weakens, causing him to slowly vanish! To make things worse, the Explosive Virus Time Bomb Ukyo has set is slowly reaching its countdown.