The co-director of Doctor Who: The Abominable Snowmen has explained why certain characters' designs were altered.
The special release, which was released on DVD and Blu-ray on September 5, is an animated recreation of the 'The Abominable Snowmen' serial, in which Patrick Troughton's Doctor travelled to Tibet in the 1930s to fight the Yeti and Great Intelligence.
The BBC has lost only the second episode of the series so the decision was made last year to adapt the serial in animated form in order to present the story to a wider audience.
Chloe Grech and Gary Russell co-directed the film, which includes altered graphics for the Tibetan monks, and Russell explaining the decision at a conference at BFI Southbank (via RadioTimes).
Russell said he wanted to "rectify the mistakes" made in the original's whitewashing: "My only real concern about [original director] Gerald Blake's directing was casting white people to play Asian characters."
Russell continued, "That was an obvious thing that we were going to do." We were going to correct that mistake that was made in 1967, because it's just awfully insulting."
The Abominable Snowmen is part of a busy year for Doctor Who, with the forthcoming BBC Centenary special set to be Jodie Whittaker's last appearance as the Time Lord. In May, Ncuti Gatwa was announced as the Fourteenth Doctor, marking the first time a Black actor has led the series.
Russell T Davies, who acted as showrunner for Doctor Who from 2005 to 2010, will continue to direct the series from 2023's 60th anniversary special onwards, succeeding Chris Chibnall in the role. Davies, who recently won acclaim for It's a Sin, has promised to add more diverse cast for his forthcoming episodes.
Doctor Who: The Abominable Snowmen is now available on DVD and Blu-ray.