Can Missy ever become good? What will the Doctor risk to find out?
Subscribe for more exclusive Doctor Who clips and content: http://www.youtube.com/subscription_center?add_user=doctorwho
Want to share your views with the team behind Doctor Who and win prizes? Join our fan panel here: https://tinyurl.com/YouTube-DoctorWho-FanPanel
This is a channel from BBC Worldwide who help fund new BBC programmes.