Scientists Leslie, Coffin, and their assistant Grant fret over the discovery of E-112, a new element from the center of the Earth that explodes rocks when exposed to air. It threatens to bring about the end of the world. THE NIGHT THE WORLD EXPLODED stars Kathryn Grant and William Leslie.

This Sam Katzman-produced sci-fier was originally released on a double bill with Katzman's GIANT CLAW. The plot is motivated by a newly discovered element called E-112, which festers at the Earth's core. Rising to the surface in the form of liquefied stone, E-112 becomes extremely dangerous when it is mixed with nitrogen. Before long, the entire world is threatened with the explosive power of the volatile element. To save Mankind from being blown to smithereens, seismologist David Conway (William Leslie) tries to neutralize E-112 with a combination of volcanic gases and silver iodide. Despite all the scientific doublespeak, THE NIGHT THE WORLD EXPLODED is doggedly nonintellecutal in its execution and appeal.