Bio: Atom Eve was a child created by the government to be a weapon. At birth, she was switched with a dead baby, going home with a caring family. At a very young age she was a prodigy in science and received a scholarship to a prestigious school. Her scientific ability turned out to be an early manifestation of her powers. A man approached her one day, warning Eve that her powers may be her downfall and encouraged her to never to use them again.
Prior to the first issue of Invincible, Atom Eve joined the Teen Team as an after-school superhero. She soon started a friendship with Invincible after the two met saving a shipment of video game consoles from a Mauler twin. Eve & Mark are around each other so much that many people (teacher, students, parents) believe there is something going on between the two even though they continue to say that they are "just friends". After finding out Rex Splode, her boyfriend, was cheating on her with Dupli-Kate, she was sick for days. Although she did not join the new Guardians of the Globe along with her Teen Team teammates, she continued as an active superhero for some time. However she eventually decided that her talents were being wasted on superheroics and that she could do more good elsewhere. Subsequently she quit superhero work and moved to Africa to engage in aid work. She has come out of "retirement" in response to large threats, like the cosmic villain Omnipotus and a Martian invasion.
Invincible met with a future version of Atom Eve that confessed her undying love for him. She instructed him to either tell her that he loved her, or that he hated or didn't want anything to do with her romantically, so that she could get on with her life. While Invincible is recovering from the incident with the Reanimen, he flies to meet Eve, whom he had not talked to since the fight with Angstrom Levy. After sharing a friendly hug and an awkward pause afterwards, they share a passionate kiss. Immediately afterward, however, Mark apologizes and voices his guilt at going behind his girlfriend's back, and is verbally relieved to be called to fight off an alien invasion.
After hearing that Invincible broke up with his girlfriend, Eve showed up at his dorm asking, "So -- are we dating or what?", but left without a word when he told Eve about his encounter with her future self.