Mild-mannered reporter Clark Kent and Lois Lane are sent to the small town of Silsby for the inauguration of the world's deepest oil well. The drill shaft has penetrated the deep underground home of the "Mole Men", a race of small, furry, though bald-headed humanoids. The Mole Men come up through the shaft at night, and when the creatures first emerge on the surface, their sudden appearance scares to death the elderly night watchman. Lois Lane and Clark Kent arrive at the oil well and find the dead watchman. Subsequently, help arrives. Clark Kent and the foreman are exploring the surrounding area for signs of intruders when Lois sees one of the creatures and screams. But no one believes her when she tells them what she saw.