Will Mysterio finally uncover the identity behind the mysterious mask? Only time will tell. Rey Mysterio on kicking ... which has since gone down in the WWE history books.

WWE Hall of Famer Rey Mysterio's status for WWE WrestleMania ... Chad Gable, the man "allegedly" beneath the El Grande Americano mask, has never had a singles match at WrestleMania.

He is a three-time World Champion and is arguably the best underdog in the history of ... one-on-one with Mysterio, El Grande could load up his mask once again and nail Rey with a headbutt.