Boris KarloffDr. Victor Sartorius Arthur MargetsonRoger Clifford Anthony IrelandCapt. Arthur Halliday Morton SeltenSir Charles Clifford Nina BoucicaultMary Clifford Victor RiettiDoctor Bousquet Wilfrid CaithnessMorrocan Official Edward L. AlpersonExecutive Producer James A. CarterArt Direction William LuffDirector Of Photography Sydney BlytheDirector Of Photography Michael C. ChorltonEditor W.L. TrytelOriginal Music Composer Heinrich FraenkelAdaptation 
