Amy Allen was recruited into a rogue military black ops unit when she was arrested for assault and battery and faced jail time. This rogue group made a habit of accepting dubious freelance contracts in addition to their own projects. Using the same extra-terrestrial metal that comprises Captain Atom's skin, the group grafted the metal onto Amy's human skin. At that moment, the quantum-wielding powerhouse known as Bombshell was born.
After Superboy's tragic death during the Infinite Crisis, the Teen Titans faced a year of heartache and turmoil. Deathstroke saw this as an opportunity to infiltrate the group and retrieve the computer disk which contained the spirit of his son, Jericho. To that end, Deathstroke hired Bombshell to join the Titans in a mission to liberate his son. Once in the tower, Bombshell stole the Jericho disk, only to have it stolen from her by Raven.
The reorganized Titans later tracked down Bombshell over the South China Sea as they searched for the missing Raven. Bombshell accused Ravager of betraying the team, while Raven successfully brought back Jericho by using one of Brother Blood's resurrection rituals. Once the team located Raven and Jericho, Bombshell was revealed as a the real traitor. Through the combined might of the Titans, Bombshell's quantum metal skin was shattered, leaving her powerless.
Amy Allen was taken into custody to await trial. Cyborg and Miss Martian later returned to interrogate Allen, still curious to discover who she was working for. Before she revealed any information, Allen has her throat slit by a batarang administered by Batgirl, who had just joined Deathstroke's Titans East team.
Like Captain Atom, Bombshell's metal skin is tied into the Quantum Field, which enables her to absorb and manipulate energy. This energy is often channeled as force blasts through her hands, or large bursts of explosive force. This energy also allows Bombshell to fly and gives her enhanced super-strength. Bombshell's metallic skin is virtually indestructible.