She always there to back up the Doctor, but how will Mandip Gill fare alone against a #DoctorWho puzzle?
New episodes premiere Sundays at 8/7c. Catch up on previous episodes on the BBC America app or at bbcamerica.com/doctorwho.
Subscribe now: http://bit.ly/1aP6Fo9
Twitter: http://twitter.com/bbcamerica
Facebook: http://www.facebook.com/bbcamerica
Tumblr: http://bbcamerica.tumblr.com
Instagram: http://instagram.com/bbcamerica
Snapchat: http://snapchat.com/add/bbcamerica_tv
Visit our official website to watch full episodes and more: http://www.bbcamerica.com/