When did Synostone Season 1 Episode 21 air?
Synostone Season 1 Episode 21 aired on May 24, 2017.


The one who protects the world by becoming one with the spirits, 'Mask Masters' exists. world. Against the forces of darkness, the new power of the Mask Masters, 'Synostone' together. Unimaginable transformation robot.
Direct answers for episode-level questions and details.
Synostone Season 1 Episode 21 aired on May 24, 2017.
This episode runs for approximately 26 minutes.
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