Nigel Green was replaced by Douglas Wilmer as Scotland Yard detective Nayland Smith.

In 1924, Dr. Fu Manchu, his army of dacoits and his vicious daughter Lin Tang are kidnapping the daughters of prominent scientists and taking them to his hidden base in the Atlas Mountains, where he demands that their fathers help him to build a device that transmits blast waves through a radio transmitter, which he intends to use to take over the world.

[5] Credits adapted from the booklet of the Powerhouse Films Blu-ray boxset The Fu Manchu Cycle: 1965-1969.

[6] The Brides of Fu Manchu (all uncredited) Sharp recalled producer Harry Alan Towers used the film to showcase "young and beautiful actresses".

Sharp recalled filming went "smoothly but already the signs were there that" Towers could make Fu Manchu movies without having to "worry too much because the stories were okay.