David Tennant and Billie Piper star in a “special scene” written and filmed for the BBC’s Children In Need telethon. Not a spoof sketch, the short “mini-episode” bridges the gap between The Parting Of The Ways and the upcoming Christmas special, The Christmas Invasion. Though it can be considered an official part of the storyline, this is not considered a standalone episode of Doctor Who. 
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.
The 726th episode of Doctor Who (the 28th since the series’ revival) airs on BBC1, continuing the revived series’ tradition of including a special Christmas episode. Comedian Catherine Tate makes a guest appearance as Donna Noble, a hapless bride whose wedding is called off by extraterrestrial events beyond her control. David Tennant’s former Blackpool co-star Sarah Parish guest stars as the Empress of the Racnoss, and this marks the first time in the new series that the Doctor identifies Gallifrey as his home planet. The Doctor begins and ends the episode without an ongoing companion.
The 727th episode of Doctor Who (the 29th since the series’ revival) airs on BBC1. Freeman Agyeman, having played a very small guest role in the previous season’s finale, is introduced as new TARDIS traveler Martha Jones. This episode introduces the Judoon, a rhinoceros-like intergalactic police force which recurs in many future episodes.
BBC1 airs the first segment of an animated Doctor Who adventure, The Infinite Quest, as part of the youth-oriented fan feedback series Totally Doctor Who. David Tennant, Freema Agyeman, and Anthony Stewart Head lead the voice cast. The full story, assembled into a single episode, will be made available later on DVD.
The 728th episode of Doctor Who (the 30th since the series’ revival) airs on BBC1. Dean Lennox Kelly guest stars.
The 729th episode of Doctor Who (the 31st since the series’ revival) airs on BBC1. Ardal O’Hanlon and Georgine Anderson (Century Falls) guest star.
The 730th episode of Doctor Who (the 32nd since the series’ revival) airs on BBC1. Hugh Quarshie (Star Wars Episode I) and Andrew Garfield (The Amazing Spider-Man) guest star. This is the first part of a two-part story.
The 731st episode of Doctor Who (the 33rd since the series’ revival) airs on BBC1. Hugh Quarshie (Star Wars Episode I) and Andrew Garfield (The Amazing Spider-Man) guest star. This is the second part of a two-part story.
The 732nd episode of Doctor Who (the 34th since the series’ revival) airs on BBC1. Mark Gatiss (The League of Gentlemen) guest stars.
The 733rd episode of Doctor Who (the 35th since the series’ revival) airs on BBC1.
The 734th episode of Doctor Who (the 36th since the series’ revival) airs on BBC1. This is the first half of a two-part story, and is based upon a popular 1995 Doctor Who novel of the same name by Paul Cornell.
The 735th episode of Doctor Who (the 37th since the series’ revival) airs on BBC1. This is the conclusion of a two-part story, and is based upon the popular 1995 Doctor Who novel Human Nature by Paul Cornell.
The 736th episode of Doctor Who (the 38th since the series’ revival) airs on BBC1. Though it is this season’s “Doctor lite” story – featuring minimal appearances from David Tennant and Freema Agyeman – Blink proves to be hugely popular, thanks in no small part to the most popular enemy that the new series has produced to date, the Weeping Angels, making their first appearance here. Blink goes on to win a Hugo Award for Best Dramatic Presentation (Short-Form).
The 737th episode of Doctor Who (the 39th since the series’ revival) airs on BBC1. Guest starring John Barrowman and Sir Derek Jacobi, this is the first part of a three-part season finale reintroducing the Master, the Doctor’s rival Time Lord from the classic series.
The 738th episode of Doctor Who (the 40th since the series’ revival) airs on BBC1. Guest starring John Barrowman and John Simm (Life On Mars), this is the second part of a three-part season finale reintroducing the Master, the Doctor’s rival Time Lord from the classic series. This episode offers the first glimpse of the Time Lords – in full classic series regalia – since the beginning of the new Doctor Who series.
The 739th episode of Doctor Who (the 41st since the series’ revival) airs on BBC1. Guest starring John Barrowman and John Simm (Life On Mars), this is the final part of a three-part season finale reintroducing the Master, the Doctor’s rival Time Lord from the classic series. Freema Agyeman departs the TARDIS as Martha in this episode, returning as a recurring character the following season.