Trapped in a burning building while attempting to save a life, Billy uses his supersonic whistle to call Superboy, but Superboy, preoccupied with saving a thousand people on a Pacific island from a tsunami, is unable to reach him in time. Upset by his inability to save his parents and friends, Superboy exiles himself until, three months later, Perry White, using Billy's whistle, calls him back into action to battle Lex Luthor. After defeating Luthor, Clark makes peace with his limitations and returns to Metropolis for his final year of college. Now 21, Kal-El starts calling himself Superman, 13 years after his debut as Superboy.Superman: The Secret Years #4 (1985)
