Kash appeared once at World Wrestling Federation (WWF) television tapings, using ring name David Jericho, on April 28, 1998, on WWF Shotgun Saturday Night where he was defeated by Taka Michinoku. During a WWF house show against the tag team Too Cool, Kash broke both of his ankles after performing a botched hurricanrana on Scotty 2 Hotty.
The injury sidelined Kash for a while but upon his return to the ring, he resurfaced in Extreme Championship Wrestling (ECW) in late 1999 under a new gimmick, Kid Kash. Just months after his return, Kash suffered a broken jaw in Atlanta at the hands of The Dupps. Despite the injury, Kash continued to wrestle. He even wrestled on the Guilty as Charged pay-per-view the very next night. Kash recovered from the injury without any problems and went on to wrestle tag matches, cruiserweight-style matches, and even wrestled Mike Awesome for the ECW World Heavyweight Championship at Living Dangerously on March 12, 2000, although he lost after he was superbombed from the top rope through a table. His tag team partners during the time include the likes of Rob Van Dam, Super Crazy, Nova and The Sandman. Kash won the ECW World Television Championship by defeating Rhino on August 26, 2000. A few weeks later, Rhino would reclaim the title from Kash. On October 1 at Anarchy Rulz, Kash pinned EZ Money in a singles match. At November to Remember, Kash defeat C.W. Anderson. On December 3 at Massacre on 34th Street, he and Super Crazy were defeated by The Unholy Alliance (Yoshihiro Tajiri and Mikey Whipwreck) in a tag team match. At Guilty as Charged, he, Super Crazy and F.B.I. (Little Guido and Tony Mamaluke) were both defeated by The Unholy Alliance in a three way dance tag team match. After Guilty as Charged, the promotion went defunct in 2001.
Two months later, after ECW folded, Kash signed with World Championship Wrestling, where they billed him as Cash. His only match was on the final episode of Thunder, airing on March 21, where he lost to Jason Jett. That same week, WCW was purchased by the World Wrestling Federation.
Kid Kash's first appearance on WWE television was as one of many wrestlers interfering in the main event at ECW One Night Stand. His first official WWE outing, however, was the June 19, 2005 airing of Sunday Night Heat against Tajiri in what was designated a tryout match. Kash then wrestled a few matches on Velocity, before coming up to SmackDown. Kash showed up after a tag team match between MNM and The Mexicools on SmackDown, and viciously attacked Juventud. The following week, he faced off against Mexicool member Super Crazy. Kash picked up the win, earning himself a title match with Juventud at Armageddon. Kash, making his first WWE pay-per-view debut on December 18 at Armageddon, defeated Juventud to win the Cruiserweight Championship. On January 29 at Royal Rumble, Kash lost the Cruiserweight Title to Gregory Helms.
After losing the Cruiserweight Championship, Kash began to frequently tag team with fellow cruiserweight Jamie Noble to take on the face members of the cruiserweight division; during May 2006, Kash and Noble used a gimmick where they wore dog collars, often barked at and bit opponents, and wrestled rather aggressively. Soon after the team formed, Kash received a new haircut. The pair were soon named The Pit Bulls and entered the hunt for Paul London and Brian Kendrick's WWE Tag Team Championship. On July 23 at The Great American Bash, he and Noble were defeated by London and Kendrick. This was Kash's last WWE pay-per-view appearance. His last WWE appearance came on the September 29 episode of SmackDown, where Kash and Noble lost to KC James and Idol Stevens in a tag team match. On September 27, 2006, WWE announced that Kash was released from his WWE contract.