Doctor Doom developed this device early in his career, and found a chance to test it during his second encounter with Spider-man in Doom's hidden laboratory at New York City. The machine included metallic spheres orbitting a magnetical core. The balls were virtually unstoppable and presented a real threat when approaching an enemy. Spider-man disabled the machine by covering the core with web, thus nullifying the power source of the spheres. The spheres fell harmlessly to the floor… except because later Spider-man tripped on the balls and fell, giving the advantage to Doom. Doom was forced to retreat from the fight just at that point.

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