A warship that can navigate land, sea, and air becomes Japan's last defence against an ancient underwater civilisation bent on reclaiming the surface world.
In this satire of 1950s sci-fi matinees, Lou Costello plays an amateur scientist who invents a time machine that also has a way of changing people into strange things as it moves them through time.
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.