A freighter heads towards Metropolis harbor only to be attacked by a number of giant flying insects. Superman responds to the ship's SOS and goes to battle the insects. Superman lifts the ship and away from the insects. The insects return to their "home", which are giant mounds of earth outside Metropolis. The insects reveal themselves to be humans wearing insect outfits.
The next day, a lone insect settles on a ledge at the Daily Planet building and goes to abduct Jimmy. Hearing the commotion, Clark changes into Superman and pursues the insect raider. The raider attempts to delay Superman by toppling a nearby statue with sonic waves. Superman stops the large statue from hitting innocent bystanders and continues his pursuit.
Superman arrives at the mounds, goes inside one and sees Jimmy is sealed inside with high explosives all around him. The insect leader threatens to detonate the explosives as he leaves for another raid. Once the insects are gone, Superman drills through the mound to where Jimmy and the explosive eggs are located. Superman draws out the eggs via super suction and destroys them safely and rescues Jimmy.
Just as the insect raiders are about to attack a squadron of transport planes, Superman catches up with them and defeats them soundly and takes them to prison.
Later, back at the Daily Planet, Jimmy remarks to Clark that he never feared for his safety as he has Superman for a friend and Clark responds that it's good to hear that.