[2][14] Smith's affinity toward professional wrestling began during childhood when he watched tapes of WWE (then-WWF)'s Saturday Night's Main Event, which became his favorite program.

[10] Smith ended his ice hockey career plans, turning down a scholarship offer from Bemidji State University[15] and began training under TRCW promoter Bobby Jay,[10] whom he met while he was stacking shelves at an IGA store.

[21] He later won an eight-man tournament, defeating Nate Hardy, Chris Sabin, and Amazing Red, to win the Premier Cup and the NWA Canada X-Division Championship on June 2.

[24][25][26] After his release from WWE, Omega intended to forge a career in mixed martial arts and entered Brazilian jiu-jitsu tournaments before deciding to return to professional wrestling.

[37] In 2011, at the Nanae Takahashi 15th Anniversary event produced by World Wonder Ring Stardom, Omega competed in a three-minute exhibition match against a nine-year-old girl named Haruka.

[55] Omega returned to DDT for the promotion's Ultimate Party event on November 3, 2019, during which he and Riho scored a victory over Honda and Miyu Yamashita in a tag team match.

[56] On November 1, 2008, Omega appeared for Pro Wrestling Guerrilla (PWG) during the 2008 Battle of Los Angeles, where he was defeated in the first round of the tournament by local talent Brandon Bonham.

[61] On November 20, 2009, Omega entered the year's Battle of Los Angeles, which was contested for the vacant PWG World Championship, defeating Kevin Steen, Scott Lost, and Joey Ryan in the first, quarter, and semifinal rounds, respectively.

[78] On January 23, 2011, at Fantastica Mania 2011, an NJPW and Consejo Mundial de Lucha Libre co-promoted event in Tokyo, the Golden☆Lovers lost title back to Apollo 55.

[85] Omega, dubbing himself the Cleaner, made his debut under contract on November 8 at Power Struggle, where he was revealed as the newest member of Bullet Club, despite having previously dismissed the idea of joining the villainous foreigner stable, claiming that he did not consider himself a gaijin.

[99] Six days later, he and The Young Bucks–the Bullet Club subgroup known as The Elite–won the NEVER Openweight 6-Man Tag Team Championship from The Briscoe Brothers and Toru Yano at Honor Rising: Japan 2016, an event co-produced by NJPW and ROH.

[122] During the G1 Special in USA in July 2017, Omega defeated Michael Elgin, Jay Lethal, and Tomohiro Ishii in an eight-man tournament to become the inaugural IWGP United States Heavyweight Champion.

[135] On June 9, Omega defeated Okada in a two out of three falls match with no time limit for the IWGP Heavyweight Championship at Dominion 6.9 in Osaka-jo Hall, becoming the first Canadian wrestler to win the title in the process.

[141][142] It was revealed in October that Cody, Page, and Marty Scurll would be known alongside Omega and The Young Bucks as part of The Elite,[143] with the group also stating that they were "no longer affiliated with Bullet Club".

[155][156] At Chris Jericho's Rock 'N' Wrestling Rager at Sea Part Deux: Second Wave in January 2020, Omega and Adam Page defeated SoCal Uncensored (Frankie Kazarian and Scorpio Sky) to win the AEW World Tag Team Championship, marking the first title change in the promotion's history.

[165] From October to November 2020, he participated in a tournament to determine the number one contender for the AEW World Championship and won it by defeating Adam Page in the final round at Full Gear.

[185] Omega's team failed to regain the championship later that month on Dynamite, losing to the retaining House of Black in a three-way-trios match that also involved The Jericho Appreciation Society.

[187] At Double or Nothing on May 28, Moxley, Bryan Danielson, Claudio Castagnoli, and Wheeler Yuta of the BCC defeated Omega, The Young Bucks, and Page in an Anarchy in the Arena match after interference from Callis' new client Konosuke Takeshita.

[190] On August 27 at All In, Omega, Adam Page and Kota Ibushi was defeated by Bullet Club Gold (Jay White and Juice Robinson) and Konosuke Takeshita in a trios match.

[192] On October 1 at WrestleDream, Omega along with Kota Ibushi and Chris Jericho lost to The Don Callis Family members Takeshita, Will Ospreay and Sammy Guevara.

[195] On November 18 at Full Gear, Omega and Jericho, known as The Golden Jets, defeated The Young Bucks, receiving a AEW World Tag Team Championship match.

[203] On the January 8, 2025 episode of Dynamite, Omega appeared to address the fans before he was attacked by Don Callis Family members Brian Cage, Kyle Fletcher, and Lance Archer, only to be saved by former rival Will Ospreay.

[204] In 2019, AEW announced a partnership with Lucha Libre AAA Worldwide, and Omega made his debut for the latter promotion at its Triplemanía XXVII event, teaming with Matt and Nick Jackson in a losing effort against Fénix, Pentagón Jr., and Laredo Kid.

[213] At the Hard To Kill pay-per-view in January 2021, he competed for the promotion, teaming with fellow former Bullet Club stablemates Karl Anderson and Doc Gallows to defeat Rich Swann, Chris Sabin, and Moose.

[217] In November 2022 at Historic X-Over, Omega returned to New Japan Pro-Wrestling via a video message, challenging IWGP United States Heavyweight Champion Will Ospreay, to a match for the title at Wrestle Kingdom 17.

[3] He named his finishing maneuver the One-Winged Angel (a reference to Final Fantasy VII character Sephiroth) and the running knee strike he employs as a signature maneuver the V-Trigger (a technique used in Street Fighter V);[35][225] integrated the Hadouken attack from the Street Fighter video game series as a signature move;[226] and used of variations of Mega Man antagonist Dr. Wily's theme music as entrance themes.

[229] In addition to video games, Smith also draws inspiration from the television show Star Trek: The Next Generation and superhero cartoons to develop elements of his in-ring persona.

[233] In an interview, he stated that he was told that his otaku gimmick was "too bubbly" for Bullet Club, which led to him adopting the Cleaner nickname as a reference to people who clean up crime scenes.

[234] Although Smith originally intended to embody the gimmick straightforwardly, he later integrated comedy into the persona as a response to people who thought he was portraying a janitor, doing so by coming out for his matches holding a mop and a broom.

[249] He portrayed the character Cody Travers in a live-action portion of a trailer for Street Fighter V: Arcade Edition in 2018,[250] and voiced a fictionalized version of himself in the third episode of the 2023 animated series Captain Laserhawk: A Blood Dragon Remix.