In a thrilling main event at the WWE x AAA Worlds Collide event held in Las Vegas on September 12, 2025, Dominik Mysterio added a major accolade to his career by winning the AAA Mega Championship, while continuing to hold the WWE Intercontinental Championship simultaneously. The victory came after a high-stakes match against El Hijo del Vikingo, culminating in a controversial finish aided by interference from Judgment Day stablemates and El Grande Americano[1][2][3].

Dominik’s triumph marks the first time a Mysterio has claimed the AAA Mega Championship, adding a new chapter to the family’s legacy, especially given the title’s relatively recent creation in 2007—one year after Rey Mysterio first secured the WWE World Championship[6]. On this landmark night, Rey Mysterio himself returned to the ring to honor his son by placing the prestigious AAA Mega title around Dominik’s waist, fulfilling a vow made before the match, despite some initial hesitation[1][2].

The match itself was a back-and-forth spectacle featuring intense high-flying maneuvers and near falls. Vikingo, donning gear commemorating Mexican Independence Day, maintained a heel persona that drew boos from the crowd despite his champion status[6]. The clash included spectacular spots such as Vikingo’s 450 and 630 splashes and Dominik’s signature 619 and frog splash. A key moment arose when El Grande Americano interfered, dragging the referee out and allowing Dominik to load a metal plate inside his mask to deliver a decisive headbutt and frog splash combination, securing the pinfall at 18 minutes[1][2].

According to Fightful and WWE.com, after the match, the rivalry intensified as Rey Mysterio was unexpectedly forced out of the ring by Dominik, signaling a complex narrative likely to unfold in WWE programming[2][3]. Judgment Day’s involvement, including Finn Balor, JD McDonagh, and El Grande Americano, added a villainous edge to Dominik’s victory, blurring the lines between hero and heel for the WWE Intercontinental and new AAA Mega Champion[1][4].

While Dominik basks in newfound success, another major WWE update emerged from backstage. A top WWE Superstar recently underwent surgery, per sources close to the company—though the identity and details remain confidential at this time. WWE insiders report the procedure was precautionary, aiming at a full recovery to avoid extended absence from in-ring competition. This development highlights WWE’s ongoing commitment to talent health and wellness following a grueling schedule marked by recent injury concerns[5].

In addition to these headline moments, WWE SmackDown hosted several dark matches that showcased emerging talents and tested new story dynamics. Although not televised, these matches contributed to storyline progressions and talent evaluations for upcoming pay-per-views and weekly programming. Reports from ringside note promising performances that could set the stage for future main roster breakthroughs[5].

Industry watchers and wrestling analysts alike view Dominik Mysterio’s dual championship reign and his AAA Mega title win as a significant push cementing him among WWE’s rising stars. According to sources close to Cody Rhodes and podcasts covering WWE backstage happenings, this elevation is part of a broader creative direction aimed at blending WWE talent with major international promotions like AAA to expand storytelling horizons[5].

Key Takeaways:

• Dominik Mysterio is the new AAA Mega Champion, adding to his WWE Intercontinental Championship, after defeating El Hijo del Vikingo at WWE x AAA Worlds Collide[1][2][3].
• The victory included interference by Judgment Day members and El Grande Americano, who aided Dominik with a loaded mask tactic[1][2].
• Rey Mysterio honored Dominik by presenting the AAA Mega title, highlighting the historic nature of the win[1][2].
• A top WWE superstar has recently undergone surgery with the aim of a full recovery, though official details remain under wraps[5].
• WWE SmackDown dark matches showcased emerging talent and teased future storylines off television[5].

With Dominik Mysterio now a symbol of crossover success between WWE and AAA, and the behind-the-scenes focus on superstar health, WWE continues to build layered narratives and emphasizes wellness in its global wrestling product. Fans should expect intriguing developments in the coming weeks as Dominik’s championship status evolves and the recovery of top talent progresses.

Sources: WWE.com, Fightful, Wrestling Inc., Post Wrestling, Ringside News