 Despite its large budget, this serial utilized many sets from other  Universal films, such as the laboratory and crypt set from  _Bride of Frankenstein (1935)_ (qv), the castle interiors from  _Draculas Daughter (1936)_ (qv), the idol from  _Mummy, The (1932)_ (qv) and the opera house interiors from  _Phantom of the Opera, The (1925)_ (qv). In addition, the outer  walls of Mings castle were actually the cathedral walls from  _Hunchback of Notre Dame, The (1923)_ (qv).