in episode 3, william russell appears only in a pre-filmed insert as he was on holiday. julian glover was cast by douglas camfield to play king richard i. glover would return to "doctor who" to play scaroth in "city of death" (1979). jean marsh, who played princess joanna, would play sara kingdom in "the daleks' master plan" (1965–66) and morgaine in "battlefield" (1989). marsh was married to third doctor actor jon pertwee from 1955 to 1960.