Davros first appeared in the 1975 serial "Genesis of the Daleks", written by Terry Nation. Nation, creator of the Dalek concept, had deliberately modelled elements of the Daleks' character on Nazi ideology, and conceived of their creator as a scientist with strong fascist tendencies. The physical appearance of Davros was developed by visual effects designer Peter Day and sculptor John Friedlander, who based Davros' chair on the lower half of a Dalek. Producer Philip Hinchcliffe told Friedlander to consider a design similar to the Mekon from the "Eagle" comic "Dan Dare", with a large dome-like head and a withered body.