 Unfortunately, episode 1 of The Mind of Evil contains no colour information. In principle, BBC engineers were supposed to filter out the chroma dots upon telerecording, to create a cleaner picture. In most cases they failed to do so, allowing the colour recovery process to work. For this one episode, the filter had been correctly applied – so there was no colour to recover. To complete the serial for DVD, the episode was manually colourised by Stuart Humphryes and Peter Crocker – thereby returning the final Pertwee episode to its original colour presentation.
