DVD
Most Doctor Who DVDs have been released first in the United Kingdom with Region 2, and released later in Australia and New Zealand (Region 4) and in North America (Region 1). Aside from differences in the external packaging, special features and commentaries are mostly identical in all versions. The Region 1 release of The Five Doctors contains a commentary track featuring Peter Davison and Terrance Dicks not available on the earlier Region 2 release. All Region 1 releases prior to September 2005 also included a "Who's Who" feature that identified key cast members and gave brief biographies and filmographies. The Region 1 releases of Robots of Death, The Ark in Space, The Talons of Weng-Chiang, and Pyramids of Mars also include a featurette with the syndicated Time-Life introductions and closings narrated by Howard da Silva.
There are also minor variations having to do with technical glitches that occurred in the Region 2 discs but were corrected in time for the Region 1 release (The Caves of Androzani, Remembrance of the Daleks, Complete Series Two box set).
The Region 2 discs released up to 2009 have also been dual coded with Region 4, so the two have been identical. This practice ceased for new releases in 2009. The only exceptions are Vengeance on Varos, which fixed an error on the Region 2 version in episode 2, and Remembrance of the Daleks, which used the NTSC master due to errors on the UK version and issues about music clearance.
The Region 1 classic series DVDs are labelled with story numbers, which are listed below. The numbering system follows that used in the 1995 reference work The Discontinuity Guide. It differs slightly from that used by Doctor Who Magazine (the source for the Wikipedia list of Doctor Who serials), firstly by including the uncompleted serial Shada, and secondly by counting the four segments of The Trial of a Time Lord as four separate stories. Because of this, both schemes are identical until the 108th story, The Horns of Nimon, after which they diverge. The Region 1 DVDs of the 2005 revival of Doctor Who do not have story numbers, so none are listed here.
As well as the DVDs, episode soundtracks, including releases of soundtracks where the video elements of episodes no longer exist with linking narration being added as a substitute are also released on CD. For a full list of these and other releases, see List of Doctor Who audio releases.
As of 22 October 2012, 143 stories (including 130 complete stories, 12 incomplete stories and 1 story reconstructed with animation) from the classic era (1963–1996) have had all their existing footage released on DVD. 1 incomplete story has had only half its existing footage released on DVD and 16 stories (including 2 complete stories, 5 incomplete stories and 9 missing stories) remain completely unavailable on DVD.
Read more about this topic: List Of Doctor Who DVD And Blu-ray Releases