Ian Stuart Black was a well-established television writer, having penned episodes for numerous programmes since the early 1960s. These included classics such as H. G. Wells' The Invisible Man and The Saint. He also wrote for and co-created Danger Man, starring Patrick McGowan. As a regular viewer of Doctor Who, Black thought that a Doctor Who writer's credit would impress his children. So, around December 1965, on an impulse following a script conference at the BBC, Black visited the Doctor Who production office and enquired about writing for the series. Script editor Gerry Davies commissioned Black to write The White Savages on January 19th 1966. For a time, it was considered as a replacement to Donald Cotton's comedic The Gunfighters. In the end, however, Black's script would follow it into production. Since The Gunfighters was serial Z, the alphabetical method of assigning production codes had now been exhausted, so The White Savages was designated serial AA. Peter Purvis' character of Stephen was scheduled to leave in this serial, so Black was asked to incorporate his departure into the script. It was planned that Stephen's replacement, who was provisionally named Richard or Rich, would join the Doctor and Dodo in the next serial The War Machines, also written by Black. Christopher Barry, whose last Doctor Who work had been on The Romans, was assigned as the director, and filming started at Ealing Studios at the end of April 1966. By now, the story title had been truncated to The Savages. Location filming began on April 29th at Shire Lane Quarry near Chalfont St Peter in Buckinghamshire for scenes set in the craters. May 1st saw cast and crew visit Callow Hill Sandpit in Virginia Water Surrey, which doubled as the ravine. A few production photos survived showing the cast and crew taking a break during location filming. Studio recording at Riverside One began on May 13th, and as usual, each instalment was taped on consecutive Fridays. One change instituted by producer Innes Lloyd was to stop giving each Doctor Who episode its own title. This tradition had run from an unearthly child the first episode of the first story, through to the OK Corral, which was the last episode of the previous story. From The Savages onward, each episode would receive an episode number caption instead, a practice that continued until the programme's relaunch in 2005. Unusually the first eight scenes of Part 4 were recorded immediately after the completion of the third episode. This was done to save having to remount the sets and dry ice effects in the studio the following week. Particularly noteworthy is Freddy Jaeger's performance of Jano. When Jano takes on aspects of the Doctor's personality, Jaeger produces a wonderful emanation of Hartnell's characteristics and mannerisms. Ian Stewart-Black went on to write a further two Doctor Who stories. The first of these, The War Machines, immediately followed The Savages, and a year later Black penned The Macra Terror for Patrick Troughton's first season.