The Hell's Belles are a group of female mercenaries that consisted of Tremolo, Briquette, Vague and Flambe. The group's mentor is the assassin known as Cyber and they are after a former member of the Belles named Shrew who was being guarded by X-Factor. Shrew was scheduled to testify against the drug cartel that hired them so Cyber and the Belles wanted her out of the picture. Cyber and the Belles are eventually defeated by X-Factor .

Years later, Hell's Belles returned and fought the new young team Children of the Atom. Tremolo, Vague and Flambe still depowered, and Briquette rejoined the team.