semi-finals on the March 13 episode of 205 Live. The Undisputed Era (2018–2021) At NXT TakeOver: New Orleans, during the triple threat match for the NXT Tag Team Championship and the Dusty Rhodes Tag Team Classic trophy, Strong turned on his partner Pete Dunne and joined The Undisputed Era, turning heel. The next morning at WrestleMania Axxess, Strong teamed with O'Reilly to defend the NXT Tag Team Championship, making him one of the champions via the Freebird Rule. At the Greatest Royal Rumble, Strong competed in the namesake match, entering at #34 and eliminating Rhyno before being eliminated by Baron Corbin. At NXT TakeOver: Chicago II, O'Reilly and Strong defeated Danny Burch and Oney Lorcan to retain the NXT Tag Team Championship. On day 2 of the 2018 WWE United Kingdom Championship Tournament, O'Reilly and Strong lost the NXT Tag Team Championship against Moustache Mountain (Tyler Bate and Trent Seven). However, they would regain the championships on the July 11, 2018, episode of NXT, after Bate threw in the towel over an injured Seven. At NXT TakeOver: Brooklyn 4 on August 18, O'Reilly and Strong defeated Moustache Mountain again to retain the titles. All four members of the Undisputed Era competed in a WarGames match at NXT TakeOver: Wargames II on November 17 against Ricochet, Pete Dunne, War Machine (Rowe, and Hanson), in a losing effort. At NXT TakeOver: Phoenix on January 26, 2019, Strong and O'Reilly lost the NXT Tag Team Championship to the War Raiders, ending their reign at 219 days. At NXT TakeOver: New York on April 5, Strong interfered in Adam Cole's NXT Championship match against Johnny Gargano. Afterwards, Strong would begin a feud with Matt Riddle. At NXT TakeOver: XXV on June 1, Strong was defeated by Riddle. On August 10 at NXT TakeOver: Toronto, Strong competed in a triple threat match against Pete Dunne and Velveteen Dream for the NXT North American Championship, which Dream won to retain the title. On September 18 during the debut episode of NXT on the USA Network, Strong defeated Velveteen Dream after interference from the Undisputed Era to win the NXT North American Championship, giving him his first single title in WWE, and giving the Undisputed Era all three male championships available in NXT. He would then, alongside the Undisputed Era, begin a feud against Tommaso Ciampa, Riddle, and Keith Lee which would lead to a WarGames match