Initially called "The Kid" on the WWF website, he became known as X-Pac by the next "Raw". X-Pac feuded with Jeff Jarrett, ultimately defeating him in a hair-vs-hair match at SummerSlam, then with WWF European Champion D'Lo Brown, whom he dethroned on September 21, 1998. He re-lost the title to Brown two weeks later, then won it again at in October. Waltman lost the title to Shane McMahon on February 15, 1999. At WrestleMania XV, he lost a championship rematch when Triple H betrayed him, and hit him with his Pedigree finisher. X-Pac then sided with Road Dogg against Triple H, Chyna and Billy Gunn, after the temporary demise of DX. X-Pac and Road Dogg wanted a reformed DX to be about rebellion, while the others wanted it to be about making money. X-Pac befriended Kane, a mute, angry loner whom he partially socialized and encouraged to speak, through an electrolarynx. They won the WWF Tag Team Championship twice together. After DX reunited in late 1999 as a heel group, X-Pac led Kane to believe he would be inducted into DX, but instead betrayed him and eventually stole his new girlfriend, Tori. In 2000, X-Pac feuded with fellow DX member Road Dogg, and Chris Jericho, whose botched powerbomb sidelined Waltman for three months with another neck injury.