More than one "invisible man" terrorizes Metropolis; and Lois feels invisible to Superman, whose visibility as a celebrity has its price.

Metropolis is hit with a strong heat wave in the middle of winter, and people believe that Superman is the cause. Lex Luthor is ultimately behind the heat and wants to see Superman gone. Clark decides to leave Metropolis, but Lois finds out that the Luthor nuclear plant is to blame.