The event aired via pay-per-view (PPV) and livestreaming and featured wrestlers from the promotion's Raw and SmackDown brand divisions.

This marked WWE's first major stadium event to take place in the United Kingdom since the 1992 SummerSlam and the company's first UK PPV overall since Insurrextion in 2003.

In the main event, Roman Reigns defeated Drew McIntyre to retain the Undisputed WWE Universal Championship.

[5] The event aired on pay-per-view (PPV) worldwide and was available to livestream through Peacock in the United States and the WWE Network in international markets.

This broke a company record at the time, with more fans registering for pre-sale tickets than any other WWE event, including WrestleMania.

[15] On the July 8 episode of SmackDown, Drew McIntyre was scheduled to face fellow European native Sheamus to determine the number one contender for the Undisputed WWE Universal Championship at Clash at the Castle.

[20] After Bianca Belair retained the Raw Women's Championship at SummerSlam, she was confronted by the newly formed stable of Bayley, Dakota Kai, and Iyo Sky.

Later that same night, Riddle engaged into another brawl with Rollins before challenging him to a match at Clash at the Castle, which was made official.

[26] On the August 19 episode of SmackDown, Sheamus won a fatal five-way match to become the number one contender for Gunther's Intercontinental Championship at Clash at the Castle.

Later that night, a match pitting Edge and Rey against Priest and Bálor was made official for Clash at the Castle.

[1] The actual pay-per-view opened with Alexa Bliss, Asuka, and Raw Women's Champion Bianca Belair facing Damage CTRL (Bayley, Dakota Kai, and Iyo Sky) in a six-woman tag team match.

[1] In the main event, Roman Reigns defended the Undisputed WWE Universal Championship against Drew McIntyre.

During the match, as Reigns attempted a Superman Punch, McIntyre countered and performed the Future Shock DDT.

Austin Theory ran out and attempted to cash in his Money in the Bank contract, however, professional boxer and UK native Tyson Fury, who was in the front row, knocked him out.

[32] Brent Brookhouse of CBS Sports stated that "from start to finish, Clash at the Castle brought it in the ring, including one of the best matches of the year".

He called the finish "a copout", but "in Levesque's defense he inherited this match on the schedule and shouldn't be criticized for doing such a good, convincing job building up Drew as a possible winner here", and also said that "Theory's run-in was a fun moment".

[34] Due to the success of Clash at the Castle, on January 5, 2023, WWE announced a return to the United Kingdom for the annual Money in the Bank event on July 1, 2023, at London's O2 Arena.

Dominik then came out, flanked by The Judgment Day (Finn Bálor, Damian Priest, and Rhea Ripley) and ignored his father.

[41] Also on Raw, footage was shown of Seth "Freakin" Rollins rejecting Matt Riddle's rematch challenge immediately after their match at Clash at the Castle.

[42] On October 1, UFC Hall of Famer Daniel Cormier was appointed as the special guest referee for the match.

[43] Also, Damage CTRL (Bayley, Dakota Kai, and Iyo Sky) continued to target Alexa Bliss, Asuka, and Raw Women's Champion Bianca Belair.

Kai and Sky went on to win the WWE Women's Tag Team Championship on the September 12 episode of Raw.

Bayley then stated that she wanted a Raw Women's Championship match at Extreme Rules, reiterating the fact that she pinned Belair at Clash at the Castle.

[41] The following week, Sky defeated Bliss due to Bayley and Kai preventing interference from Asuka and Belair.

After the match, Damage CTRL laid out Bliss, Asuka (who would both be out of action for four weeks), and Belair before heading on the top of a ladder.

[44] On the following episode of SmackDown, Solo Sikoa officially joined The Bloodline, thus making his main roster debut.

[47] Also on SmackDown, Imperium (Gunther, Ludwig Kaiser, and Giovanni Vinci) defeated The Brawling Brutes (Sheamus, Ridge Holland, and Butch) in a six-man tag team match.

Rey was supposed to compete in the men's Royal Rumble match, but he never came out when his entrance music played.