Mysterio also won the Tag Team Championship four times, making him the WWE's 21st Triple Crown and Grand Slam champion. He also competed in the Royal Rumble and has headlined multiple WWE pay-per-view events. After leaving WWE in 2015, he wrestled in New Japan Pro-Wrestling (NJPW) and AAA before returning to WWE in 2018. Mysterio has always been concerned about privacy, but there are a few anecdotes about the masked icon that every fan should know. Rey Mysterio may have seemed to the wrestling community as the ultimate hero during his career, but he hasn't always been faultless.