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: "Clark Kent's Single Identity"
Pages: 16

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

Writer: Otto Binder
Artist: George Papp

Feature Character(s)

• Superboy (last appearance in Adventure Comics #332; next appearance in Superboy #121)

Supporting Character(s)

• Jonathan Kent (last appearance in Superboy #120; next appearance in Superboy #121)
• Martha Kent (last appearance in Superboy #120; next appearance in Superboy #121)
• Lana Lang (last appearance in Superboy #119; next appearance in Superboy #122)
• Krypto (last appearance in Superboy #119; next appearance in Superboy #121)
• Police Chief Parker (last appearance in Superboy #119; next appearance in Superboy #137)

Villain(s)

• Professor Vakox (last appearance in Superboy #117; next appearance in Superboy #162)
• Kru-El (last appearance in Superboy #117; next appearance in Superboy #189)
• Jax-Ur (last appearance in Superboy #117; next appearance in Superboy #162)
• "Monk" Lennox, "Bugs" Wilson, two jewel thieves, and a school bully (no further appearances)

Other Character(s)

• The Mayor and citizens of Smallville (no further appearances)

Cameo Appearance(s)

• Jor-El (as a thought projection)
• Lara (as a thought projection)

Synopsis:
Superboy unexpectedly loses his powers without explanation. Initially he believes that he was exposed to Red Kryptonite, but the power loss lasts longer than 48 hours. After nearly a month without powers, Smallville worries about their missing hero. With the help of Jonathan Kent, Clark fakes his powers, allowing Superboy to return.

Eventually, the Phantom Zone villains mentally contact Superboy. Professor Vakox admits that they were responsible for the power loss by creating a new form of Kryptonite with properties of both Red and Green K. Superboy is forced to release Vakox from the Phantom Zone to concoct an antidote. Vakox attempts to double-cross the Boy of Steel. Superboy is prepared and uses Green Kryptonite to force Vakox to keep his word. Vakox is returned to the Phantom Zone, and the antidote restores Superboy's powers.