David Cain is a fictional character in the }. He first appeared in Batman #567 (July 1999), and was created by Kelley Puckett and Damion Scott.
David Cain is one of the world's premier assassin, whose victims have included some of the most famous and powerful people on the planet. He trained the young Bruce Wayne with the skills that he would use as Batman, although Bruce has never used such techniques. Regarding his training, Batman explained, "Knowing how to kill doesn't mean you must kill."
Cain desired a perfect partner with whom to carry out his assassination plans. Attempts to train young children resulted in failure, so he decided to conceive one himself. He found the perfect mother in a martial artist named Sandra Wu-San. He watched her and her sister duel at a tournament and concluded that it was her sister Carolyn that was holding Sandra back from her full potential. He murdered Carolyn and ambushed Sandra with the help of Ra's al Ghul and his League of Assassins. In exchange for sparing her life, Sandra agreed to bear David's child and leave the child in his care for him to train.
The child, Cassandra, would be Cain's "One Who Is All," whose native tongue was one-on-one combat and ability to read people's intentions simply by their body language. The latter was a special gift that only the Wu-San sisters and Cassandra knew. After bearing his child, Sandra set out to become Lady Shiva. His alias is Texas Dave.
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