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David Cain was hired by Lex Luthor to frame Bruce Wayne for murder as revenge for preventing him from possessing Gotham through the forging of title deeds.
Batgirl (Cassandra Cain) and Batgirl (Barbara Gordon) once faced each other in combat however the girl under the mask turned out to be Harley Quinn instead of Barbara Gordon.
A Battle of Hypothetical Proportions appeared in Wizard Magazine #112, January 2001, pitting Batgirl (Cassandra Cain) against Batgirl (Barbara Gordon). The battle's outcome has Batgirl (Cassandra Cain) winning.
