Bomb made his wrestling debut in 1989 under the ring name The Nightstalker and competed in the American Wrestling Association. Wrestling legend Ox Baker began to manage Nightstalker during this time, providing for some classic promotional segments with Baker on the mic. The Nightstalker had a heated feud with The Trooper. This began as The Nightstalker appeared during a Trooper match versus W.T. Jones on April 13, 1990. Ox Baker began to challenge any and all wrestlers to include Larry Zbyszko. Clark's in-ring look included black and white face paint, while gripping an over-sized hatchet.
As the AWA went into dormancy in the fall of 1990, he made the jump to World Championship Wrestling. He made his first appearance on the November 10 edition of WCW Saturday Night and defeated Gary Jackson. Ten days later, he faced Sid Vicious at Clash of the Champions XIII: Thanksgiving Thunder and was defeated. He then formed an alliance with The Big Cat and was scheduled to team with him against Vicious and Dan Spivey at Starrcade. He would miss the pay-per-view and be replaced by The Motor City Madman.
He would be absent from WCW until October 1991, when he made an appearance as a masked "ghoul" at Halloween Havoc. Two months later he replaced an injured Diamond Studd at Starrcade to team with Rick Steiner in a losing effort to Vader and Mr. Hughes.
On March 8, 1993, he received a tryout match for the World Wrestling Federation, wrestling Reno Riggins at a WWF Superstars taping in North Charleston, South Carolina as The Nightstalker. He had another tryout match the following night at a WWF Wrestling Challenge taping, defeating Ricky Nelson. In May 1993, he debuted as Adam Bomb, the newest client of Johnny Polo. Wearing luminous green contact lenses, and sporting a red tongue. Bomb's gimmick was that of a survivor of the infamous Three Mile Island nuclear meltdown accident, which was further emphasized by his ring name being a pun on the "atom bomb". Seven months after his debut, Harvey Wippleman replaced Polo as Bomb's manager because Polo wanted to focus on managing WWF Tag Team Champions The Quebecers.
Bomb made his pay-per-view debut at Survivor Series, where he teamed up with Irwin R. Schyster, Diesel and "The Model" Rick Martel against Razor Ramon, The 1-2-3 Kid, Marty Jannetty and "The Macho Man" Randy Savage in an elimination match. His team went on to lose the match, though he was the last remaining wrestler for his team before being pinned by Jannetty after a roll-up.
Following this, he participated in the 1994 Royal Rumble, where he was the final entrant in the match. However, he lasted less than five minutes before being eliminated by Lex Luger. He also was one of nine wrestlers who helped Yokozuna beat The Undertaker during a casket match. Following the Rumble and a feud with Earthquake, at WrestleMania X, Bomb lost to Earthquake in 35 seconds. Bomb turned face after his manager Harvey Wippleman turned on him and helped new client Kwang attack him. As a face, he would throw rubber nuclear missiles into the audience as he walked to the ring and after he won a match. After briefly feuding with Kwang and Bam Bam Bigelow, Bomb was moved down the card and began competing exclusively on WWF Superstars before leaving the promotion in August 1995.
At WCW Uncensored 1997, Bomb rejoined WCW as Wrath, a helmeted martial artist who, along with Mortis, battled Glacier and Ernest Miller. The angle continued until 1998, when Wrath suffered an injury. After recovery, he returned to singles action later in the year as a face, debuting both a new attire and finishing move called the Meltdown. After a lengthy undefeated streak, Wrath was rumored to be slated to become a future challenger to Bill Goldberg but had his momentum stopped on November 23, 1998 in a big loss to Kevin Nash. Wrath would continue to gain many victories into 1999 and entered a feud with Bam Bam Bigelow. At WCW/nWo Souled Out, Bigelow defeated Wrath to end the feud. He tore his ACL in a match against Jerry Flynn on April 15, 1999 and spent a year recuperating.
Wrath returned to the ring in April 2000, now using his real name, Bryan Clark. He formed a tag team with Brian Adams known as KroniK, and both became members of the New Blood. However, KroniK switched allegiances to the Millionaires Club after Vince Russo betrayed them and, on May 15, 2000, they defeated Shane Douglas and The Wall to win the vacant World Tag Team Championship. They later lost the title on May 30 to New Blood members Shawn Stasiak and Chuck Palumbo. KroniK was granted a rematch for the title at Bash at the Beach on July 9, and was successful in reclaiming World Tag Team Championship. KroniK then entered a feud with the entire Natural Born Thrillers stable, but retained the title against the Thrillers before losing it to Vampiro and The Great Muta at New Blood Rising on August 13. Following the title loss, KroniK turned heel after Vince Russo managed to bribe them in order to have them attack Bill Goldberg, who would be fired if he lost a single match. However, Goldberg managed to overcome the odds and pinned both Clark and Adams in a handicap match at Halloween Havoc. KroniK continued working as "hired muscle" by helping The Boogie Knights battle The Filthy Animals, and eventually helped their former enemies the Natural Born Thrillers before turning face once again in January 2001 by siding with Ernest Miller.
KroniK was sidelined when Clark needed stitches for a wound from a chair shot while Adams was hospitalized with appendicitis. While they were injured, WCW was purchased by the World Wrestling Federation in March 2001.
Clark and Adams returned to the WWF on the September 4, 2001 episode of SmackDown! by attacking and double chokeslamming The Undertaker. The team would go on to face The Brothers of Destruction at Unforgiven 2001 in a match for the WCW Tag Team Championship, which Clark and Adams lost. After two dark matches and a pay-per-view appearance, Clark was released from his contract.