Yu-Gi-Oh! ZEXAL - Episode 004

'''Turnabout Countdown! The Counter-Measure is Astral!?''' is the fourth episode of Yu-Gi-Oh! ZEXAL.

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!