time with grey shoulders. Two more elements of the Dalek hierarchy are also introduced; the Dalek Emperor and Daleks with black domes which appear to act as the Emperor's personal guard. (This motif appears again in "The Parting of the Ways" (2005), with black-domed Daleks fulfilling a similar function.) For the first time a Dalek is seen with a black pupil centred in its eye lens. An unusual version of the Mark 3 Dalek made an appearance in The Evil of the Daleks. It featured narrow skirt and shoulder sections, with the rear skirt panel having only a single vertical line of hemispheres down the middle. These differences are not alluded to in the story. This prop is sometimes referred to as "The Wilkie Dalek" after Bernard Wilkie, the BBC technical designer who became primarily responsible for the Doctor Who programme's visual effects after Shawcraft's involvement ceased during 1967. Mark 3 Daleks in the 1970s The Daleks returned in the 1972 serial Day of the Daleks, their first appearance in colour on the Doctor Who television programme. "Drone" Daleks were now finished in grey, with black hemispheres and fender. Except for Death to the Daleks (1974), and albeit with variations in the shade of grey and occasional adornment with black slats, black collars or both, this stayed as the standard Dalek colour scheme for the remaining eight serials in which they appeared over the next sixteen years. During this period, however, several small changes to the standard Mark 3 Dalek design were made and their hierarchy was again expanded. In Day of the Daleks a Dalek Leader is seen painted in gold, with black hemispheres and fender. This serial also saw the first appearance of an oval disc between the appendage boxes and a higher fender on all models. The eye lens "pupil", first seen in The Evil of the Daleks, now became a standard fitting. A gold Dalek Leader returned again in Frontier in Space (1973). Seven additional Dalek props were produced for Planet of the Daleks (1973), created by special effects professional Clifford Culley's company Westbury Design & Optical Limited. The production crew referred to these props as "goons". Although fabricated using measurements and moulds taken from an existing prop, the "goon" Daleks exhibited minor differences from the original Shawcraft builds including the substitution of single dowel neck struts for the trefoil cross section items which were the