DX Army

The night after WrestleMania, Triple H ejected the absent Michaels for "dropping the ball" over the Tyson incident. In reality, Michaels had suffered a back injury and started a four year hiatus from wrestling.^[3] Triple H assumed full leadership of D-X and recruited X-Pac, who had been recently fired from WCW, and the WWF Tag Team Champions the New Age Outlaws ("Bad Ass" Billy Gunn and The Road Dogg Jesse James) into the stable.^[3] While the intent was for the stable to remain heels, they became hugely popular and were eventually pushed as fan favorites. During this time, they feuded with the heel gimmick of The Rock and his group the Nation of Domination and then later, Vince McMahon's Corporation. The group remained united and hugely popular throughout 1998 and into early 1999.

On episodes of Raw is War in April and May DX went to war with WCW, with whom the WWF were in direct competition at the time, through a series of legitimate visits to WCW headquarters and live events. On April 27, 1998 Raw is War and WCW Monday Nitro both took place in the Hampton Roads area of Virginia, a mere 19 miles apart. D-Generation X traveled from the WWF show in Hampton toThe Scope in Norfolk and shouted insults against WCW through a bullhorn, as well as mentioning the fact that WCW gave out free tickets to fill up arenas for television while sporting black armbands with the acronym POWCW (Prisoner of WCW), which referenced Kliq members Scott Hall and Kevin Nash. They then tried to enter the arena via a loading dock, in their army jeep before being stopped by someone closing the door. They also attempted to forcibly secure meetings with Nitro's executive producer Eric Bischoff and WCW owner Ted Turner at WCW headquarters in Atlanta, Georgia. Another segment used computer graphics to make it appear as if Triple H had flown over the arena where WCW Nitro was taking place and wrote "WCW Sucks" and "DX Says Suck It" in the sky

The group also feuded with the new The Corporation Corporate Commissioner, and former DX member, Shawn Michaels who turned on the group after costing X-Pac a WWF Championship match against The Rock. The faction would continue to feud with Michaels throughout late 1998, with Michaels reversing Billy Gunn's Intercontinental Championshipvictory against Ken Shamrock,^[18] costing The Outlaws the Tag Team Titles and even managing to lure the New Age Outlaws to The Corporation on the December 7 edition of Raw is War. However, the Outlaws quickly revealed this to have been a ruse, turning on The Corporation that same night. When The Corporation turned on Michaels in January 1999, he was taken in by DX once more. This too was short lived as later that night DX were instrumental in Michaels being ambushed by The Corporation, with X-Pac commenting "What goes around, comes around".

Some of the groups most memorable promos were their parodies of their rivals. On July 6, 1998, DX carried out the first of these segments. In this instance, they mocked The Nation, with Triple H portraying The Rock (referred to as "The Crock"); Road Dogg playing D'Lo Brown (referred to as "B'Lo Brown"); "Bad Ass" Billy Gunn playing The Godfather (referred to as "The Gunnfather"); X-Pac as Mark Henry (referred to as "Mizark Henry"); and impressionist Jason Sensation as Owen Hart.^[19] On December 14, 1998, they would turn their attention to The Corporation with Triple H again appearing as "The Crock", Road Dogg playing Mr McMahon (with two midgets representing Gerald Brisco and Pat Pattersonkissing his behind throughout); Billy Gunn, playing Shane McMahon wearing an adult diaper; X-Pac playing Ken Shamrock; Chyna as The Big Boss Man; and Sensation returning to play Michaels.^[20] These parodies would be resurrected during the fourth incarnation.

Throughout 1999, the members gradually turned on one another. Initially, Chyna turned on Triple H and joined the Corporation on January 19.^[3] At WrestleMania XV Chyna turned on then fellow Corporation member Kane, helping Triple H to defeat him. Later that night, Triple H and Chyna interfered in X-Pac's European Championship match with Shane McMahon. Initially, it appeared they were there to help X-Pac, but Triple H quickly turned on him, delivering a Pedigree to his former stablemate, costing him the match. Chyna and Triple H would then join The Corporation, with Kane being ousted.^[3] As a result, X-Pac began to share a bond with Kane, which resulted in Kane becoming associated with the faction and the duo holding the WWF Tag Team Championship twice.^[21][22][23]

Though the group maintained a united front against The Corporation, Billy Gunn became frustrated at Kane's presence and The New Age Outlaws' inability to win the Tag Team Championships from X-Pac and Kane. Following one such defeat on the April 29 edition ofSmackdown, Gunn became angry at X-Pac.^[19] The following week on Sunday Night Heat he apologized to X-Pac, but attacked him when X-Pac's back was turned, citing his frustration at being "held back" and departing from D-Generation X, therefore reducing the members to just Road Dogg and X-Pac.^[16] Over the following weeks, Gunn would continue to attack X-Pac and Road Dogg, often being chased away by Kane.^[19] In July, Triple H and Chyna told Billy Gunn that Road Dogg and X-Pac were making a lot more money from D-Generation X's royalties than the other three (due to them still using the name as a tag team). This led to a tag match at Fully Loadedwhereby the winners would get the rights to use the D-Generation X name, which Road Dogg and X-Pac won. Though not officially a member, upon winning the Tag Team Titles from The Acolytes on August 9, Kane, under encouragement from partner X-Pac, uttered his first words without help from a voice box, said words being "Suck it"