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 Computer Beast Terabyte, Astral's body weakens, causing him to slowly vanish!