Playing from the first cyber cafe in Victoria, the Underground Onramp, the original roster included Dakine, MikeJ, Killboy, Zakath, Muppetman, Jello and the EG girls featured in Wired Magazine, Jasp and Mystique.

The Onramp and the EG clan were very popular in the emerging gaming circuit, being on the West Coast and having access to a T1 internet connection while the rest of the world was still on dial-up.

Evil Geniuses acquired a Defense of the Ancients (Dota) roster on April 12, 2008, made up of players transferring from team eMg.

[8] EG entered the StarCraft: Brood War scene on April 25, 2009, with the recruitment of World Cyber Games USA champions Geoff "iNcontroL" Robinson, and Dan "Nyoken" Eidson, along with Eric "G5" Rothmuller, Jake "LzGaMeR" Winstead, and Bryce "Machine" Bates.

[11] In a controversial move, EG acquired the brand of fellow North American gaming organization, Loaded, on October 9, 2010, but the deal only constituted the company sponsors, team owner and their Heroes of Newerth squad.

Within a year, they expanded their fighting game division with the addition of Ricki Ortiz, Ari "fLoE" Weintraub, and Eduardo "PR Balrog" Perez-Frangie, as well as Japanese players Yusuke Momochi, and Yuka "Chocoblanka" Kusachi.

On March 31, 2011, long-time member Manuel "Grubby" Schenkhuizen, as well as StarCraft II division manager Nick "Tasteless" Plott departed from the organization.

[14] Near the end of that month, the Korean North American Star League champion, Ho Joon "PuMa" Lee, joined up with EG, despite the lack of consultancy with his previous organization.

[15] Three weeks later, the top Canadian player, Chris "HuK" Loranger, left his long-time organization of Team Liquid, and joined EG, to compete alongside Fields and Lee in South Korea.

[16] On October 21, it was announced that the trio would be moving to stay with the South Korean team SlayerS, in accordance with a correlating partnership established between the organizations.

[18] On January 7, 2012, EG announced the dismissal of its long-standing Counter-Strike squad, though star player Jordan "n0thing" Gilbert initially stayed on to produce content related to the game.

[19] In September 2012, Bulba and xHobbzeEx left the Dota 2 team due to personal issues and were replaced by Jio "Jeyo" Madayag and Robert "bdiz" Tinnes.

On January 25, 2013, EG announced their expansion into League of Legends with the signing of the former Counter Logic Gaming European division – in negotiations that reportedly spanned three months, however the team would later disband due to extremely poor results.

On October 27, 2014, it was announced that three players from the Evil Geniuses Call of Duty squad, Patrick "Aches" Price, Ian "Crimsix" Porter, and Ken Dedo, had left the organisation, later joining OpTic Gaming.

PR Balrog, Justin Wong, Momochi, and ChocoBlanka would depart from the FGC division; Ricki Ortiz, PPMD, and K-Brad would be kept while adding NYChrisG to the team.

[27] On April 12, 2019, Evil Geniuses entered Fortnite Battle Royale by signing Jordan "JTruth" Clouse and Chance "MoNsTcR" Duncan.

[28] In late August 2019, Peter Chau, Troy "Canadian" Jaroslawski, and Aaron "Gotcha" Chung all left the Evil Geniuses Rainbow Six Siege division.

[32] The Evil Geniuses would shock the Counter Strike: Global Offensive scene by winning their first big event together, ESL One New York 2019.

On October 5, they announced the signing of "German Amigos" consisting of Leonardo “Catalysm” Crist Ramos, Ivan “ivn” Sabri, Riccardo “Rizex45” Mazzotta and coach Kuno “Mumen” Hildebrandt.

Evil Geniuses also harbored a "reserve" roster consisting of Vincent "Apoth" Le, Jeffrey "reformed" Lu, Max "Demon1" Mazanov, Kyle "ScrewFace" Jensen, and Jacob "icy" Lange.

In spite of their poor beginning, as well as an unprecedented 0–13 loss on a map against LOUD, Evil Geniuses narrowly managed to secure a spot in the Americas League playoffs.

During Champions 2023, Evil Geniuses, now strong contenders to win the event, began a flawless run up to the Upper Finals, where they would face off against a familiar rival in Paper Rex.

[43][44] Following an announcement in which Evil Geniuses' players were met with a decision to either explore new options or come back with pay cuts, the championship-winning roster ultimately disbanded; only Jawgemo and potter opted to remain with EG.

[45] After placing 9th in Stage 2 of the 2024 VCT season and failing to qualify for any of the year's international tournaments, Evil Geniuses parted ways with jawgemo and Apoth, the former of which signed with G2 Esports.

This roster included Clinton "Fear" Loomis, Rasmus Berth "MiSeRy" Filipsen, Jimmy "DeMoN" Ho, Amel "PlaymatE' Barudzija, and Pers Anders Olsson "Pajkatt" Lille.

In September 2019, Evil Geniuses acquired the Counter-Strike: Global Offensive (CSGO) team of NRG Esports the day before ESL One New York 2019.

At StarSeries i-League CS:GO Season 8, located in Belek, Turkey, Evil Geniuses faced unknown Chinese 5Power Gaming in the opening match, where they won 2–0 relatively easily, though the team would fail to take two maps away from Swedish Ninjas in Pyjamas (NiP), forcing the EG into the losers bracket.

During November, Evil Geniuses announced the signing of Dennis "Svenskeren" Johnsen, Tristan "Zeyzal" Stidam and Colin "Kumo" Zhao of Cloud9, Bae "Bang" Jun-sik of 100 Thieves, Daniele "Jiizuke" di Mauro of Team Vitality and Heo "Irean" Yeong-chol of Counter Logic Gaming as the Head Coach.

It included Troy "Canadian" Jaroslawski, Nathan "nvK" Valenti, Austin "Yung" Trexler, Brandon "BC" Carr, Ammar “Necrox” Albanna, and Jordan “BKN” Soojian as the team's Coach.

After a disappointing run in the Six Major Raleigh, Peter Chao, Gotcha, and Canadian all left the team, supporting the rumors of a potential change.