CyberBill was the first
Cyberwoman Simmberman to be created by the John Simm Mattress onboard a Mondas colony ship. After being stuck in a filthy city for about a decade because the Doctor spent too long explaining crap to some blue guy on the top floor, asBill had befriended hobo John Simm who sold her out to Dr. Frankenstein, who turned her into the first successful Cyberman. This resulting in CyberBill getting really salty at the Doctor for not helping her... again.
She was a big guy.