A professor and his colleagues follow an explorer's trail down an extinct Icelandic volcano to the Earth's centre. However, they face many challenges in their quest.
When an evil king plans to use science to capture the world, Hercules joins forces with a sorceress to beat the monarch and save Cassiopeia, his lover.
Anatasia offers Lois Cavendish her old mansion for business. However, she lays down a condition that the place is haunted and they have to free it from ghosts.