The 787th episode of Doctor Who airs on BBC1 (the 89th episode since the series’ revival). Asylum Of The Daleks opens the seventh season of the revived show, and features a surprising first appearance by new series regular Jenna-Louise Coleman, whose new companion character was originally announced as debuting in the 2012 Christmas special. (The most surprising thing about this is that preview audiences keep this secret from the entire internet for several weeks.) 
The 788th episode of Doctor Who airs on BBC1 (the 90th episode since the series’ revival). Mark Williams guest stars as Brian Williams.
The 789th episode of Doctor Who airs on BBC1 (the 91st episode since the series’ revival). Ben Browder (Farscape, Stargate SG-1) guest stars.
The 790th episode of Doctor Who airs on BBC1 (the 92nd episode since the series’ revival). Mark Williams guest stars as Brian Williams; Jemma Redgrave appears as UNIT’s new scientific advisor, Kate Stewart.
The 791st episode of Doctor Who airs on BBC1 (the 93rd episode since the series’ revival). This episode sees the exit of TARDIS travelers Amy and Rory, and the return of the Weeping Angels. Alex Kingston guest stars.
The 792nd episode of Doctor Who airs on BBC1 (the 94th episode since the series’ revival). This is the series’ 2012 Christmas special, guest starring Richard E. Grant (Withnail & I) with a voice-over appearance by Sir Ian McKellen (The Lord Of The Rings trilogy).
The 793rd episode of Doctor Who airs on BBC1 (the 95th episode since the series’ revival).
The 794th episode of Doctor Who airs on BBC1 (the 96th episode since the series’ revival).
The 795th episode of Doctor Who airs on BBC1 (the 97th episode since the series’ revival). The Ice Warriors make their first television appearance since the early 1970s. David Warner and Liam Cunningham guest star.
The 796th episode of Doctor Who airs on BBC1 (the 98th episode since the series’ revival). The Ice Warriors make their first television appearance since the early 1970s. Dougray Scott and Jessica Raine guest star.
The 797th episode of Doctor Who airs on BBC1 (the 99th episode since the series’ revival). For the first time in the new series, much of this episode’s action takes place within the TARDIS itself.
The 798th episode of Doctor Who airs on BBC1 (the 100th episode since the series’ revival). Dame Diana Rigg (The Avengers, On Her Majesty’s Secret Service) and her real-life daughter Rachael Stirling guest star.
The 799th episode of Doctor Who airs on BBC1 (the 101st episode since the series’ revival). Warwick Davis (Willow, the Star Wars movies) guest stars in an episode written by Neil Gaiman, featuring the Cybermen.
The 800th episode of Doctor Who airs on BBC1 (the 102nd episode since the series’ revival), closing the new series’ seventh season and setting up hints toward the much-anticipated 50th anniversary special. John Hurt and Richard E. Grant guest star.
The BBC debuts the Doctor Who minisode Night Of The Doctor on the internet, reintroducing Paul McGann as the eighth Doctor in his first on-screen appearance since the 1996 TV movie and depicting his apparent regeneration into a previously unknown incarnation of the Doctor, as played by John Hurt. The minisode debuts on McGann’s birthday, but was originally intended to premiere much closer to the 50th anniversary special, Day Of The Doctor, until it became apparent that word of McGann’s secretive return to Doctor Who was about to be leaked.
The 801st episode of Doctor Who airs on BBC1 (the 103rd episode since the series’ revival). This is the show’s 50th anniversary special, starring Matt Smith, David Tennant, and John Hurt, with past Doctors putting in appearances via archive footage; Tennant’s co-star Billie Piper also appears, though not as Rose Tyler. This is the first episode since 1976 to feature the shape-shifting Zygons, and it adds a major plot twist to the Time War.
The 802nd episode of Doctor Who airs on BBC1 (the 104th episode since the series’ revival). This Christmas-themed episode sees the exit of Matt Smith as the eleventh Doctor (revealed during the story to actually be the thirteenth and final Doctor), but bends the long-standing mythos surrounding regeneration in time to introduce Peter Capaldi as the new Doctor. The production staff behind the scenes will remain largely intact for the transition into the Capaldi era.