In June 1990, Crush debuted in the World Wrestling Federation (WWF) as the third member of the WWF Tag Team Champions Demolition. With Crush joining Demolition, the trio exercised the Freebird Rule allowing any combination of the three to defend the tag team title, which allowed Crush to become a Tag Team Champion. He was brought in as a substitute for Ax to defend the titles with Smash. Crush debuted at a live event on June 5, where he and Smash successfully defended the titles against The Rockers. Crush made his televised debut with Demolition on the June 23 episode of Superstars, teaming with Smash in a quick victory over Paul Diamond and Joe Champ. On the July 28 episode of Saturday Night's Main Event XXVII, Crush and Smash retained the titles against The Rockers, after Ax (who was the illegal man) clotheslined and pinned Shawn Michaels. At the SummerSlam pay-per-view, Demolition, with new member Crush, lost the title to The Hart Foundation in a two out of three falls match with Crush getting pinned for the final fall to lose the title. After SummerSlam, Demolition shifted focus from the belts to their already incipient feud with The Legion of Doom which had intensified after the latter team interfered in the title change match. Crush continued to perform as part of Demolition until after WrestleMania VII, where he and Smash lost to Genichiro Tenryu and Koji Kitao. After WrestleMania, the WWF decided to disband Demolition as a team.
Crush went back to work for the WWF in 1992 and was given a new fan favorite character of an easygoing surfing Hawaiian who wore bright neon tights and utilized a new two-handed skull vice finisher called the Cranium Crunch. Crush made his televised debut in WWF under his new character on the May 9, 1992 episode of Superstars, defeating Kato. The two would continue to work at house shows that month. Crush made his first pay-per-view appearance under the gimmick with a win over Repo Man at SummerSlam. Crush then engaged in a feud with Doink the Clown, after he was attacked with a loaded prosthetic arm while confronting the clown about his cruel pranks on children at ringside, which caused Crush to miss the 1993 Royal Rumble. The feud culminated at WrestleMania IX, where Crush lost after a second, identical Doink appeared from underneath the ring and struck Crush with the prosthetic arm. At the first King of the Ring pay-per-view, Crush challenged Shawn Michaels for the Intercontinental Championship, but lost the match after a distraction by Doink.
On July 4, Crush injured his back in the Stars and Stripes Challenge trying to bodyslam the WWF Champion Yokozuna, who at the time had a billed weight of 580 pounds. The bodyslam challenge took place on the USS Intrepid. Crush, generally considered to have the best chance of those present, was the first wrestler to actually get Yokozuna off his feet but his back gave out forcing him to stop. Lex Luger won the challenge. On the July 12 episode of Monday Night Raw, Crush unsuccessfully challenged Yokozuna for the WWF Championship. After the match, Yokozuna sent a message to Luger by performing several Banzai Drops to Crush. This angle was used to write Crush off television to recover from his back injury.
Crush returned to WWF on the October 18 episode of Monday Night Raw and attacked his on-screen friend Randy Savage, because Savage had encouraged him to enter the Body Slam Challenge, and had failed to contact him during recuperation. Crush then allied himself with Yokozuna and Mr. Fuji, becoming a villain. Crush adopted a "Japanese sympathizer" character to go with his new attitude. The new gimmick included: growing a beard, using a new face paint design different from his Demolition character, and wearing a darker color scheme than the pink and orange Kona Crush character. At Survivor Series, Crush headlined the event as part of Foreign Fanatics (Yokozuna, Ludvig Borga and Quebecer Jacques) against All-Americans (Lex Luger, The Undertaker and the Steiner Brothers). This rivalry led to a falls count anywhere match against Savage at WrestleMania X, which he lost.
Crush would become a hired gun for his manager Mr. Fuji, helping his new client Jeff Jarrett win a King of the Ring qualifying match against Lex Luger on the May 21 episode of Superstars by attacking Luger outside the ring, causing him to lose by count-out. In retaliation, Luger cost Crush, a King of the Ring qualifying lumberjack match against Tatanka on the June 6 episode of Raw. As a result, the pair began a short program. During the rivalry, Crush formed a tag team with Fuji's client Yokozuna, challenging The Headshrinkers for the WWF Tag Team Championship at King of the Ring. They lost the match after Luger distracted Crush. Their rivalry culminated in a match on the August 21 episode of Sunday Night Slam, which Luger won after Ted DiBiase distracted Crush. After the loss, Crush left the WWF.
In 1995, Crush returned to the WWF at Royal Rumble and took part in the Royal Rumble match as the number thirty entrant. He eliminated Billy Gunn, Bart Gunn, Adam Bomb, and Headshrinker Fatu before being eliminated by British Bulldog.
Crush was brought back to the WWF with a new biker look at the beginning of the Monday Night Wars. He made his surprise return to WWF on the August 12, 1996 episode of Monday Night Raw, with Clarence Mason, his lawyer as his manager. He defeated Savio Vega with a full nelson and began using the heart punch as his new finishing move. At Survivor Series, Crush was paired with Goldust, Jerry Lawler and Hunter Hearst Helmsley against Marc Mero, Jake Roberts, Rocky Maivia and Barry Windham in a Survivor Series match. Crush's team was on the losing end. In the fall of 1996, Crush began a rivalry with Vega, during which, he and Clarence Mason joined Nation of Domination under the leadership of Faarooq, another client of Mason.
Crush's rivalry with Vega ended when he joined the Nation in early 1997. Crush aided Faarooq in his feud with Ahmed Johnson. After his loss to Goldust at King of the Ring, Crush argued with Savio Vega, during Faarooq's WWF Championship title shot, which distracted Faarooq, causing him to lose the match. The following night on Raw is War, Crush and Vega, along with the rest of Nation were fired by Faarooq, turning Crush face for the first time since 1993. As a result, Crush began feuding with Faarooq and formed his own biker faction called Disciples of Apocalypse, which was introduced on the June 23 episode of Raw is War.
Crush led the DOA into a gang war against Faarooq's Nation of Domination and Savio Vega's Los Boricuas throughout late 1997, thus turning into a fan favorite. The three leaders fought in a triple threat match at Ground Zero, which Vega won. The DOA traded wins with Los Boricuas at SummerSlam, Badd Blood: In Your House and the November 22 episode of Shotgun Saturday Night. DOA had their next rivalry with The Truth Commission, which culminated in a Survivor Series match between the two teams at Survivor Series, which Truth Commission won.
Crush left the WWF in the fall of 1997. His absence was explained by a storyline injury sustained during a brawl with Kane on the November 24 episode of Raw is War. Crush's last appearance was on the November 29 episode of Shotgun Saturday Night, where DOA defeated enhancement talents Steve Corino, Marty Garner, Mike Hollow, and Jason Ahrndt.
Crush signed with World Championship Wrestling (WCW) and made his debut on the February 16, 1998 episode of Nitro as a heel by attacking Bret Hart, revealing himself as the newest member of the New World Order (nWo). Crush made his in-ring debut under his real name, Brian Adams, on the February 19 episode of Thunder in a tag team match with nWo teammate Curt Hennig against Davey Boy Smith and Jim Neidhart, with the match resulting in a double disqualification. The nWo split in April 1998 and Adams chose to join Hollywood Hogan's nWo Hollywood faction. Adams made his pay-per-view debut at Slamboree against Lex Luger in a losing effort.
Adams received a shot for the World Heavyweight Championship against Goldberg on the July 27 episode of Nitro, but failed to win the title. He lost to Steve McMichael at Road Wild and pulled out an upset win over Eddie Guerrero on the August 30 episode of Monday Nitro, only after Guerrero laid down for Adams on purpose due to his protest with WCW management.
Adams became a lower card performer; he often tag-teamed with the likes of Scott Norton and Stevie Ray, occasionally losing matches against smaller and lesser known wrestlers. However, he also gained quick victories over enhancement talents in singles competition. He was usually used by the nWo as a henchman due to his big size. Adams and Norton defeated Fit Finlay and Jerry Flynn in Adams' debut at Starrcade.
In 1999, Adams was put into nWo Black and White or nWo B-Team, a group of mid-card nWo wrestlers of the nWo Reunion after both nWo factions united. Adams was put into a partnership with Horace Hogan and the two participated in a tournament to crown the new WCW World Tag Team Champions. They ousted Billy Kidman and Chavo Guerrero, Jr. and Faces of Fear before losing to Curt Hennig and Barry Windham and Chris Benoit and Dean Malenko in semi-final matches.
Afterwards, he was chosen to portray "The Demon" after walking out on the New World Order and entering a limo that supposedly had the band inside. He played the character for its debut on the August 23 episode of Nitro, in which KISS also played a live concert. He would play it one more time to come out and have a staredown with Vampiro and abandoned it afterwards without wrestling. The Demon mantle was subsequently passed to Dale Torborg with no explanation given. Adams switched back to competing under his given name and returned for a title shot for the United States Heavyweight Championship against Sid Vicious on the October 4 episode of Nitro, where he lost. After defeating Horace Hogan on the October 13 episode of Thunder, Adams took a hiatus.
In the spring of 2000, Adams received the biggest push of his WCW career when he was put into a tag team with Bryan Clark called KroniK. The team debuted at Spring Stampede as Vince Russo's mercenaries in the New Blood stable, helping Shane Douglas and Buff Bagwell to beat Ric Flair and Lex Luger to win the World Tag Team Championship by delivering a High Times to Luger.
However, KroniK switched allegiances to The Millionaire's Club after Russo betrayed them and they defeated Douglas and The Wall to win the World Tag Team Championship for the first time on the May 15 episode of Nitro, thus turning face. KroniK dropped the belts to New Blood members Perfect Event on the May 31 episode of Thunder. At The Great American Bash, KroniK defeated The Mamalukes to earn a title shot at the tag team titles and began their second reign by beating Perfect Event at Bash at the Beach. KroniK then entered a rivalry with the entire Natural Born Thrillers faction, and retained the tag team titles against the Thrillers and Misfits in Action in a Four Corners match before losing them to Vampiro and The Great Muta at New Blood Rising.
Following the title loss, KroniK lost a first blood chain match to The Harris Brothers at Fall Brawl. On the October 2 episode of Nitro, KroniK turned heels after Vince Russo managed to bribe them in order to have them attack Goldberg, resulting in a handicap elimination match at Halloween Havoc, which Goldberg won.
KroniK helped The Boogie Knights battle The Filthy Animals in subsequent matches at Mayhem and Millennium Final. As the year ended, KroniK were hired by their former enemies, the Natural Born Thrillers, during which they helped them at the Starrcade event, by facing Reno and Big Vito in a tag team match, during which Reno turned on Vito and had been revealed as the one who had paid KroniK to assault Vito in the previous weeks. A month later, at Sin, KroniK turned faces by ending their association with Thrillers, as they turned on Thrillers leader Mike Sanders by helping Ernest Miller beat Sanders to become the WCW Commissioner. The following month, at SuperBrawl Revenge, KroniK made their final pay-per-view appearance, where they were scheduled to face Totally Buffed (Lex Luger and Buff Bagwell), in a number one contender's match for the tag team titles. Clark was injured by Mike Awesome before the match, leaving Adams to face them in a handicap match, which he lost. KroniK remained with WCW until the company was purchased by WWF on March 23, 2001.
After the WWF's purchase of WCW, KroniK appeared in WWF as part of the Alliance storyline. During their time in WWF, they were managed by Steven Richards and were placed in a short feud with The Brothers of Destruction (The Undertaker and Kane). Adams and Clark faced, and lost to, the duo at the 2001 Unforgiven pay-per-view. They were both released soon after.
On August 13, 2007, Crush passed away.