 Galloway returned to WWE in April 2017 and joined the developmental brand NXT, where he won the NXT Championship at , becoming the first man to win the championship in his TakeOver in-ring debut and the first WWE wrestler to hold it after having previously won a championship on the main roster.Upon returning to WWE's main roster in 2018, he won the Raw Tag Team Championship with Dolph Ziggler, became the winner of the 2020 men's Royal Rumble match, and defeated Brock Lesnar for the WWE Championship at WrestleMania 36, while also becoming the thirty-first Triple Crown champion in the process.He is also the only Briton to hold a world championship in WWE.