The TARDIS materialises in the middle of a gang's turf war. The Doctor is caught in the crossfire but helped to hospital by Chang Lee. But what is the sentient ooze escaping from the TARDIS? Subscribe here for more exclusive Doctor Who clips and content http://bit.ly/SubscribeToDoctorWho The Brand New Doctor Who Website - http://www.doctorwho.tv Doctor Who YouTube Channel http://www.youtube.com/user/doctorwho Doctor Who Facebook: https://www.facebook.com/DoctorWho Doctor Who Twitter https://twitter.com/bbcdoctorwho WATCH MORE: Regenerations: http://bit.ly/DWRegenerations The Thirteenth Doctor: http://bit.ly/TheThirteenthDoctor Title Sequences: http://bit.ly/DWTitleSequences Welcome to the Doctor Who Channel! Travel in the TARDIS with clips dating back to the Doctor's first incarnation in 1963, all the way through dozens of regenerations. Including behind-the-scenes footage, exclusive videos and our very own 'Doctor Who: The Fan Show' - this is the place to find all the best official clips from all the years of Doctor Who history. Want to share your views with the team and win prizes? Join our fan panel: http://tinyurl.com/YouTube-DoctorWho-FanPanel This is a commercial channel from BBC Studios. Service & Feedback https://www.bbcstudios.com/contact/contact-us/