Comic Title: Adventure Comics #306
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: March 1963
On Sale Date: January 31, 1963 Copyright Date January 31, 1963
Source: Library of Congress, Periodicals 1963

Frequency: Monthly
Cover Price: $0.12
Page Count: 32
Editor: Mort Weisinger

Title: "The 5th Dimensional High-School"
Pages: 12

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

Artist: George Papp

Feature Character(s)

• Superboy (last appearance in Superboy #103; next appearance in Superboy #104)

Supporting Character(s)

• Jonathan Kent (last appearance in Superboy #103; next appearance in Superboy #104)
• Martha Kent (last appearance in Superboy #103; next appearance in Adventure Comics #307)
• Lana Lang (last appearance in Superboy #103; next appearance in Superboy #104)
• Pete Ross (last appearance in Adventure Comics #305; next appearance in Adventure Comics #308)
• Krypto (last appearance in Superboy #103; next appearance in Superboy #105)
• Police Chief Parker (last appearance in Adventure Comics #304; next appearance in Superboy #104)

Villain(s)

• Mr. Mxyzptlk (last appearance in Superboy #83; next appearance in Superboy #114)

Other Character(s)

• Ququrlz and various residents of the 5th Dimension (no further appearances)
• The Mayor and various Smallville residents (no further appearances)

Synopsis:
Mxyzptlk returns to Earth to play practical jokes in an attempt to become valedictorian of his 5th dimensional high-school. First he gets Superboy out of the way by tricking the Boy of Steel and Lana Lang into the 5th dimension. He then makes everyone in Smallville believe that they are Superboy.

Meanwhile, Superboy attends Mxyzptlk’s school and begins playing practical jokes of his own. He soon surpasses Mxyzptlk’s standing. His final joke is to trick the robot truant officer into bringing Mxyzptlk back home. Superboy is declared the best student and returns home with Lana and the recently arrived Krypto.