It is now common knowledge that Clark Kent's Earth parents were named Jonathan and Martha. However, in the first episode, Adventures of Superman: Superman on Earth (1952), Kent's parents were named Eben and Sarah. This is because the comics themselves were inconsistent with the Kents' given names until the characters became major players in "Superboy" comics stories at about this same time. The names Sarah and Eben were first used in the novel "The Adventures of Superman" (1942) and in the first Superman serial.