Superman [Clark Kent] (origin retold in detail); Jor-El; Zor-El (Jor-El's brother); Lara; Jonathan Kent; Martha Kent; Lana Lang; Krypto; Kal-El; Superboy [Clark Kent]; Jimmy Olsen; Lois Lane; Perry White; Lex Luthor (villain)
Recap of Superman's life beginning with his escape from the destruction of Krypton, through his adoption and raising by the Kents, his training and career as Superboy, up to his leaving Smallville for Metropolis and joining the Daily Planet after the deaths of his adoptive parents.
Superman; Lori Lemaris (guest star); Superboy (flashback); Lex Luthor (flashback); Nathan Hale; Abraham Lincoln; John Wilkes Booth; Jor-El; Lara; Zor-El; Lyla Lerrol; Alura; Chief Sitting Bull
Lori Lemaris asks Superman to go into the past and stop Atlantis from sinking. Superman, who has never before successfully changed the past tries and is amazed that it succeeds. Superman continues to change other past events, including the assassination of Lincoln, Custer's Last Stand and the explosion of Krypton.