Rey Mysterio's reputation as a sports-entertainment phenomenon reached new heights upon his WWE debut in 2002. Here are The Ultimate Underdog's 10 greatest moments during his time in WWE. Get your first month of WWE Network for FREE: http://wwenetwork.com Subscribe to WWE on YouTube: http://bit.ly/1i64OdT Visit WWE.com: http://goo.gl/akf0J4 Must-See WWE videos on YouTube: https://goo.gl/QmhBof