Roy Skelton, best known for the voice of Zippy in Rainbow, began his Doctor Who career in 1966 as the voice of the monoids.

In The Tenth Planet, 1966, he voiced various Cybermen and played a Control Technician.

In The Evil of the Daleks, 1967, he voiced the Daleks

In The Ice Warriors, 1967, he was the computer voice.

In The Wheel in Space, 1968, he voiced the Cybermen again.

In The Krotons, 1968/1969 he was the voice of the Krotons.

In 1971, he had the acting role of Norton in Colony in Space.

In Planet of the Daleks, 1973, he was the invisible Spiridon, Wester and then voice of the Daleks.

In 1973 he had another acting role as James in The Green Death.

In 1975, he was, of course, Dalek voices in ther classic Genesis of the Daleks

Again, in 1975 he was the Kraal, Chedaki

In 1976 he played King Rokon in The Hand of Fear.

Roy played Dalek voices again in Destiny of the Daleks, 1979, The Five Doctors, 1983, Revelation of the Daleks, 1985 and Remembrance of the Daleks, 1988.