Sherry and Jake take part in the subsequent battle between the Bioterrorism Security Assessment Alliance and the mutated mercenaries .
Soon after , he meets US government agent Sherry Birkin -- whose father , William Birkin , was coincidentally Albert 's research partner .
government agent and Jake take part in the subsequent battle between the Bioterrorism Security Assessment Alliance and the mutated mercenaries .
Soon after , he meets US government agent Sherry Birkin -- whose father , William Birkin , was coincidentally Albert 's research partner .