Diabolik sono io
Docudrama about the elusive comic book artist known as Zarcone, who disappeared without a trace after illustrating issue #1 of Diabolik (November 1, 1962).
Starring Luciano Scarpa, Claudia Stecher, Stefania Casini, Riccardo Mei, Manuela Parodi, Marco Vivio, Francesca Fiorentini, Paolo Buglioni, Milo Manara, Mario Gomboli
It's a documentary movie, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Chile.