Comic Title: Superboy #121
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: June 1965
On Sale Date: April 1, 1965 Copyright Date April 1, 1965
Source: Library of Congress, Periodicals 1965

Frequency: Monthly, with the exception of Feb., May, Aug. and Nov.
Cover Price: $0.12
Page Count: 32
Editor: Mort Weisinger

Title: "Jor-El's Visit to Earth"
Pages: 9

Feature(s):
Superboy (of Earth-1)

Writer: Otto Binder
Penciller: Curt Swan
Inker: Sheldon Moldoff

Reprinted In:
Superboy:The Greatest Team-Up Stories Ever Told TPB (2010)

Feature Character(s)

• Superboy (last appearance in Superboy #121; next appearance in Adventure Comics #333)

Guest Star(s)

• Jor-El (last appearance in Superman #268; next appearance in Superman #233)

Supporting Character(s)

• Jonathan Kent (last appearance in Superboy #121; next appearance in Superboy #122)
• Martha Kent (last appearance in Superboy #121; next appearance in Superboy #122)
• Krypto (last appearance in Superboy #121; next appearance in Superboy #122)

Villain(s)

• Lex Luthor (last appearance in Adventure Comics #325; next appearance in Superboy #131)
• Blak-Du and several unnamed Phantom Zone prisoners (no further appearances)
• A sea serpent (no further appearances)

Synopsis:
Superboy's father Jor-El arrives on Earth after a freak accident while using a time-stretch globe. Jor-El is still a boy having been displaced in time 25 years. Superboy meets his father and gives him a tour of Earth. During his father's time on Earth, Superboy chooses not to tell Jor-El about Krypton's fate. After sharing several hours together, Jor-El must return to Krypton. Before Jor-El leaves, Superboy tells him about Krypton's fate and gives him a piece of Red Kryptonite which may lead Jor-El to discover a way to save his homeworld. When Jor-El gets home to his own time and planet, he opens the box containing the Kryptonite. Superboy accidentally gave him a box containing amnesium, which wipes out Jor-El's memory of his visit to Earth.