The 712th episode of Doctor Who (the 14th since the series’ revival) airs on BBC1. David Tennant spends much of his first episode portraying an unconscious tenth Doctor, recovering from his regeneration; Penelope Wilton guest stars as Harriet Jones. This is the first episode of Doctor Who intended to be a Christmas special since 1965. 
The 713th episode of Doctor Who (the 15th since the series’ revival) airs on BBC1. Zoe Wanamaker guest stars, and the Face of Boe speaks!
The 714th episode of Doctor Who (the 16th since the series’ revival) airs on BBC1. Pauline Collins and Derek Riddell guest star.
The 715th episode of Doctor Who (the 17th since the series’ revival) airs on BBC1. Elisabeth Sladen reprises her classic series role of Sarah Jane Smith, the first non-enemy character from the original series to appear in the current series. John Leeson guest stars as the voice of K-9; Anthony Stewart Head (Buffy: The Vampire Slayer) also appears. 
The 716th episode of Doctor Who (the 18th since the series’ revival) airs on BBC1. Sophia Myles guest stars.
The 717th episode of Doctor Who (the 19th since the series’ revival) airs on BBC1. Roger Lloyd Pack and Don Warrington guest star. The Cybermen become the second classic series enemy to appear in the modern series.
The 718th episode of Doctor Who (the 20th since the series’ revival) airs on BBC1. Roger Lloyd Pack and Shaun Dingwall guest star. This is the second part of the story begun in Rise Of The Cybermen.
The 719th episode of Doctor Who (the 21st since the series’ revival) airs on BBC1.
The 720th episode of Doctor Who (the 22nd since the series’ revival) airs on BBC1. Danny Webb, Shaun Parks and Will Thorp guest star; this is the first part of a two-part story, and is the first appearance of the Ood.
The 721st episode of Doctor Who (the 23rd since the series’ revival) airs on BBC1. Danny Webb, Shaun Parks and Will Thorp guest star; this is the conclusion of a two-part story.
The 722nd episode of Doctor Who (the 24th since the series’ revival) airs on BBC1. Peter Kay and Marc Warren guest star, and you can’t beat a bit of ELO.
The 723rd episode of Doctor Who (the 25th since the series’ revival) airs on BBC1.
The 724th episode of Doctor Who (the 26th since the series’ revival) airs on BBC1. Tracy-Ann Oberman and Freema Agyeman guest star. This is the first part of the two-part season finale, and introduces the modern-day Torchwood Institute.
The 725th episode of Doctor Who (the 27th since the series’ revival) airs on BBC1. Tracy-Ann Oberman guest stars. This is the conclusion of the second season of the new series, and sees Billie Piper’s exit as a series regular. The end of the episode introduces Catherine Tate as future companion Donna Noble, leading into the 2006 Christmas episode. This episode is the first to pit the Daleks against the Cybermen.