Der geheimnisvolle Dr. X

For a time Warner Brothers did not have a print of the original Technicolor version and it was assumed to be lost. The Technicolor version was finally discovered in the private collection of studio head Jack L. Warner after his death in 1978 and restored by the UCLA Archives.

As Dr. Xavier displays the wax figures of the murder victims, on the first figure, that of the "woman of the streets", the left hand can be seen trembling slightly.

This film was shot in two versions. One camera unit, under Ray Rennahan, shot the film in two-color Technicolor. A second camera unit, under Richard Towers, shot the scenes at the same time in black and white. The black and white version was meant for theaters who could not afford the higher rental cost of the color prints...black and white prints were less costly to rent.

Edited into Die Bestie mit den fünf Fingern (1946)