Their early missions included battling the evil Enerjak, who at the time was also Knuckles' great-uncle Dimitri the Echidna. After their success of capturing Renfield Rodent and forcing Robotnik to flee the island, the Chaotix remained a team, though Heavy and Bomb would end up leaving and joining the Secret Service under Geoffrey St. The group was also briefly joined by Heavy and Bomb, robots created by Robotnik, who provided the team with Power Gems and weaponry based on them in order to combat Robotnik's forces. Knuckles, requiring assistance to defeat Metal Sonic, joined up with Mighty the Armadillo, Espio the Chameleon, Vector the Crocodile and Charmy Bee.

Ivo Robotnik's lackey Renfield Rodent had successfully captured the Knothole Freedom Fighters in the House of Mirrors section of Happy Land theme park. The team has remained together over the years, but suffered the loss of Julie-Su and Saffron due to the machinations of Thrash the Devil. Since the death of Locke, they have split their duties between the war and protecting Angel Island from outside threats. The Chaotix have resided part time in both Knothole and New Mobotropolis, helping the Kingdom of Acorn battle the Eggman Empire and other threats.

All of its members are close friends with Knuckles, or else with a member who is a close friend of Knuckles', and one of them, Julie-Su, dated him. The group was originally formed when Knuckles required help in defeating Robotnik, and Metal Sonic after the Knothole Freedom Fighters were all captured. The Chaotix are Knuckles the Echidna's assistants as Guardian of Angel Island. Dark Legion (absorbed into the Dark Egg Legion).

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