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 1 releases of The 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. All Region 1 releases prior to September 2005 included a 'Who's Who' feature that identified key cast members and gave brief biographies and filmographies. Aside from differences in the external packaging, special features and commentaries are mostly identical in all versions. 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).
