After 30 years, WWE is finally bringing a major stadium event back to the United Kingdom. Clash at the Castle goes down on Sept. 3 from Millennium Stadium in Cardiff, Wales.

In the main event, undisputed WWE champion Roman Reigns will put his titles on the line in front of the U.K.'s own Drew McIntyre. It's an epic clash that puts Reigns' more than 700-day title reign at high risk of coming to an end. The SmackDown women's title is also set to be defended as Liv Morgan will take on a fresh challenger in Shayna Baszler.

The build to the show has started but the full card is far from finalized. With that in mind, let's take a look at what we know -- and what we expect -- at WWE Clash at the Castle.  

WWE Clash at the Castle matches

Undisputed WWE Universal Championship -- Roman Reigns (c) vs. Drew McIntyre: Ahead of SummerSlam, McIntyre defeated Sheamus to become No. 1 contender to the undisputed title. Reigns then defeated Brock Lesnar in a wild Last Man Standing match at SummerSlam to retain his titles, setting up the match with McIntyre. McIntyre will clearly have the hometown crowd behind him but ending the title run of Reigns has proven near impossible.

SmackDown Women's Championship -- Liv Morgan (c) vs. Shayna Baszler: Morgan successfully -- and controversially -- defended her title by pinning Ronda Rousey at SummerSlam. Of course, Morgan was tapping out to an armbar, which the referee didn't see as he counted Rousey's shoulders down. Now, Morgan will try to make a more emphatic statement against another former MMA star in Baszler, who earned her title shot by winning a gauntlet match against six other women on SmackDown.

Bianca Belair, Asuka & Alexa Bliss vs. Bayley, Iyo Sky & Dakota Kai: After Belair defeated Becky Lynch at SummerSlam to retain the Raw women's title, things got wild. First, Bayley returned from a lengthy injury layoff. Then, Sky and Kai made their way to the ring to join her. The new group immediately changed the landscape of the division and they set their sights on Belair and Lynch. Unfortunately, Lynch suffered a legitimate shoulder injury that put her on the sidelines, leaving it to Asuka and Bliss to join up with the champ to take on Bayley's crew.

Seth Rollins vs. Riddle: This match was supposed to take place at SummerSlam but was pulled at the last minute with Rollins taking out Riddle with a series of stomps. Riddle again suffered the brunt of Rollins' stomps at SummerSlam when he showed up and challenged Rollins to fight him. On Raw, Riddle announced he was now medically cleared and the two brawled again. After that, the challenge was laid down to finally face off at the upcoming pay-per-view.

Intercontinental Championship -- Gunther (c) vs. Sheamus: A new challenger was required after Gunther quelled the advances of Shinsuke Nakamura. Sheamus won a hotly contested "Fatal Five-Way" match on the Aug. 19 edition of SmackDown to crown a new challenger. Sheamus defeated Happy Corbin, Madcap Moss, Ricochet and Sami Zayn to be named No. 1 contender for the intercontinental title.

Edge & Rey Mysterio vs. The Judgement Day (Finn Balor & Damian Priest): Edge and Mysterio have both had issues with The Judgement Day, with Edge being a founder of the group and bringing Balor, Priest and Rhea Ripley in before the trio violently ejected their leader and Mysterio being one of the group's targets. Rey chose to team with Edge over his son, Dominik Mysterio, which has led to a bit of father-son tension. And, with Judgement Day having courted Dominik to join their cause in the past, that friction has led to a bit of speculation over whether Dominik may turn on his own father.