Cassandra Cain is the daughter of David Cain and a prominent member of the Batfamily, formerly Batgirl and Black Bat, and currently resides in Gotham as Orphan.
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Raised in horrifying conditions by her father, David Cain, Cassandra became one of the deadliest fighters in the world—at the expense of her ability to speak or read. Instead, she was taught to read movement and communicate through martial arts. Yet despite David's best efforts to transform his daughter from human to weapon, he was not able to crush Cassandra's innate empathy and compassion. So, when he forced her to commit murder as a test of her abilities, she realized what she had done and fled. Seeking to hide from her father, Cassandra ran to Gotham City immediately after it had been declared a No Man's Land by the government and cut off from the outside world. She infiltrated the city limits and began working as a force for order amid the chaos—something that quickly gained the attention of Oracle (Barbara Gordon), who’d been monitoring the city's upsurge in gang activity from her base, the Clock Tower.
Looking for more operatives she could trust, Barbara took Cassandra in and eventually passed the Batgirl mantle on to her. Once the No Man's Land sanctions had been lifted, Cassandra became a member of the Batman Family. Cassandra Cain was given the mantle of Batgirl by Barbara Gordon (then acting as Oracle after her paralysis by the Joker) during No Man's Land. As the new Batgirl, Cassandra was brought into the fold of the Batman Family and taught to work as a superhero on a team under the supervision of Batman and Oracle. Under Barbara's care, and with some telepathic doctoring, Cassandra's brain was made capable of understanding and producing speech, though her communication skills remained limited at best. After she proved herself by fighting a metahuman, Batman allowed Cassandra to face off against some of the more prominent Super-Villains in Gotham City.
Over time, Cassandra's past surfaced, as her father worked to track her down. David attempted to destroy Cassandra's relationship with Batman by sending him footage of her as a child, killing a man. But the plan backfired and made Batman even more certain he’d made the right choice in helping to rehabilitate her. Eventually, Cassandra learned her mother was Lady Shiva, one of the deadliest assassins in the world. Shiva herself came to Gotham to offer her daughter further training, under one stipulation: twelve months later, Shiva and Cassandra would fight to the death. When the day came, Cassandra won, becoming one of the only fighters to beat Lady Shiva in combat. But she spared her mother's life, prompting Lady Shiva to swear vengeance on her daughter the next time they met.
One year after Infinite Crisis, Cassandra was revealed to have abandoned her alter ego as Batgirl to work as a Super-Villain and leader of the League of Assassins. Distraught, confused and betrayed by her apparent change of heart, Tim Drake made an attempt to free her from the League's control, only to find himself engaged in a fight to the death with Cassandra. n her new villainous alter ego, Cassandra joined the Titans East under the leadership of Deathstroke, where she faced off against Tim during an attack on the Teen Titans. It was eventually determined that Cassandra's turn toward evil was the result of Deathstroke’s manipulation.
Once free of Deathstroke's mind control, Cassandra felt lost and disillusioned with her path in life. She resolved to hunt down both Deathstroke and her father to make them pay for what they’d done to her. But in doing so she found herself at odds with the rest of the Batman Family (BATGIRL vol. 2,2008). Bruce was able to dissuade her, and officially adopted Cassandra as his daughter shortly thereafter. She began working as Batgirl alongside Batman and the Outsiders until Bruce's apparent death in Final Crisis. With the Outsiders leaderless and Batman gone, Cassandra sought to reinvent herself. She passed the mantle of Batgirl down to Stephanie Brown and—following Bruce Wayne's return—joined Batman, Incorporated in an all new alter ego: Black Bat. With Batman, Incorporated, Cassandra acted as a Super Hero internationally, basing herself in Hong Kong.