Gareth Hunt replaced Nicky Henson as Agent No. 1 Charles Bind. Henson joined the Royal Shakespeare Company and could not do the film. Henson had originally signed on to do three Charles Bind pictures and had previously portrayed the character in the first film in the series No. 1 of the Secret Service (1977).
Star Gareth Hunt, portraying Charles Bind Agent No. 1, had previously played agent operative Mike Gambit in 'the television series The New Avengers (1976). Hunt had starred in 26 episodes in the TV show between the years 1976-1977.
Actress Fiona Curzon, who portrays the lead female character of Carlotta Muff-Dangerfield, had previously appeared in a smaller role as a bar girl in this movie's prequel No. 1 of the Secret Service (1977).