A reprogrammed Terminator, she poses as a student at John’s high school. Cameron’s model number is unknown; however, she is an advanced cyborg unlike any we have seen. With uniquely human
characteristics and drop-dead looks, she is the most lethal and
convincing infiltrator yet. Relentless in her mission to protect John Connor, Cameron absolutely will not stop. Ever.

[from http://www.fox.com/terminator/]