If you loved Hercules in the Haunted World, try Planet of the Vampires
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Mario Bava, and they both carry the 3am cult, surreal mood tags, and they sit in Adventure / Horror territory. If that's the register that drew you to Hercules in the Haunted World, the second film will land in a comparable space — through a different lens.
3am cultsurreal
What Planet of the Vampires is
Outer space. A rescue mission gone awry. Lifeless bodies walking, compelled to kill. Two spaceships descend on a fog-covered world, only to discover the previous expedition dead, reanimated, and ready to murder their saviors. Bava's low-budget shocker delivers maximum mood.

