Luthor has placed a bust of himself which emits a narcotic incense into the offices of many leaders of industry. With this, he controls them, and they lay off thousands of workers, leading to massive unemployment and economic difficulty for the whole country. Superman stops Luthor and, as Luthor flees, destroys his plane. Watching it sink into the water, he declares: "The end of Luthor!"
Some super powers on display here. Superman has perfect recall and he can contort his face to mimic another's features perfectly. Of course, we don't expect Luthor to really be dead, do we?