This one was definitely set for the teeny bopper crowd. A Phantom of the Opera-style killer is strangling the women working in a theatre, and it’s up to Santo to find him out. This is definitely one of the weakest entries in the Santo series, lacking the energy of Operacion 67 and the insanity of Santo y Blue Demon Vs. Dracula y el Hombre Lobo. Plus, half the movie is plagued by really bad musical performances from the leading acts, from a Spanish version of Fever to a really hilarious rendition of Sixteen Tons. Still it’s Santo, so there is something of a halucinatory feel to it. Either way, you could do worse. By the way, you ever notice that Santo has a Batcave-like house?