Mixed martial arts (MMA) superstar Ronda Rousey is no stranger to the world of professional wrestling. The former Ultimate Fighting Championship (UFC) women's bantamweight queen made an appearance during WrestleMania 31 and has since been speculated to return to the World Wrestling Entertainment (WWE) ring in the near future. But on the doorstep of her Octagon return later this month opposite current women's bantamweight champion Amanda Nunes at UFC 207 on Dec. 30, Rousey's future is completely up in the air. If she loses again like she did to Holly Holm back at UFC 193, Rousey is almost guaranteed to leave professional MMA, especially after her interview on "Ellen" earlier this year, and could very well reenter the WWE universe.