 There are two different US versions of this film: One is the American  International Pictures print with the original atmospheric music score  (complete with classical music pieces), and during the climactic fight  between Popoca and the Human Robot, Popoca had a scary, menacing voice (ie.  groaning and roaring). Another is the 1964 rerelease by Young Horror Club of  America, with a completely redone (and loopy) music score, somewhat different  title cards, and the voice of Popoca (in said climactic fight) was replaced  with a faint high