Watch the BBC America-Exclusive Trailer for the All New Episodes of DOCTOR WHO *** Premiering SATURDAY MARCH 30 at 8/7c *** Presented by Supernatural Saturday, only on BBC America.Through all of time and space, the unknown is everywhere. But sometimes, the universe's greatest mystery is the person right next to you..."I look at you every single day and I don't understand a thing about you.""You're the Impossible Girl, the only mystery worth solving..."In these episodes, The Doctor (MATT SMITH) is joined by his new companion Clara (JENNA-LOUISE COLEMAN) for the latest set of incredible adventures through space and time. The duo finds new adversaries and familiar friends around every corner as they journey from the bottom of the ocean in a submarine to the center of the TARDIS and beyond. The Cybermen make a thunderous return and the Ice Warrior arrives in an unexpected place.In the premiere, a modern-day urban thriller called "The Bells of Saint John" written by lead writer and executive producer Steven Moffat (Sherlock) and set in London against the backdrop of new & old iconic landmarks, a new nemesis - the Spoonheads - battle the Doctor as he discovers something sinister is lurking in the Wi-Fi.