WWE Superstars Rey and Dominik Mysterio made cameo appearances at UFC 306, held on September 14, 2024, at The Sphere in Las Vegas, coinciding with Mexican Independence Day Weekend. This event is part of the ongoing crossover following the merger of WWE and UFC under TKO Group Holdings in September 2023, showcasing a trend of cross-promotion between the two organizations. Rey Mysterio, a longtime fan of mixed martial arts, confirmed his attendance at the event, which featured a headline fight between Sean O'Malley and Merab Dvalishvili. The Mysterios have a storied history, with Dominik having turned on Rey in 2022, adding a layer of intrigue to their appearances. The event also highlighted the growing collaboration between wrestling and MMA, with WWE stars frequently appearing at UFC events. This merger and collaboration signal a new era in sports entertainment, bringing fans from both sides together.