- Bad Boss: As happened in the TV series' Skull Mask #3, Skull Mask shoots dead one of his own henchmen to prevent Moonlight Mask from gaining information from them.
- Big Bad: Skull Mask, leader of the international spy group.
- Compressed Adaptation: The Moonlight Mask TV series' Skull Mask arc, which totaled 72 installments, was adapted into two films.
- Evil Wears Black: Played straight for Skull Mask and his henchmen.
- Film Serial: Followed by Moonlight Mask - Duel to the Death in Dangerous Waters.
- Mooks: Skull Mask has a mix of skull masks like himself and men with fedoras and balaclavas, all wearing black.
- Two-Part Episode: Part 1 of 2.
Film / Moonlight Mask 1958