9. The Tenth Doctor's Easter-Egg Intervention
Premiere: June 9, 2007
Beginning with what in other hands could have been a liability – limited time in which to shoot with Tenth Doctor David Tennant and his companion Martha Jones (Freema Agyeman) – script writer Steven Moffat created a nail-biting masterpiece and the first monsters of the contemporary age to rival the all-time baddies. Guided by Easter eggs implanted on DVDs by a Doctor stranded in 1969, in the present day Sally Sparrow (Carey Mulligan) confronts the Weeping Angels, silent but deadly assassins who cease to exist when viewed straight on.