Comic Title: Adventure Comics #257
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: February 1959
On Sale Date: December 30, 1958 Copyright Date December 30, 1958
Source: Library of Congress, Periodicals 1958

Frequency: Monthly
Cover Price: $0.10
Page Count: 32
Editor: Mort Weisinger

Title: "The First Two Supermen"
Pages: 13

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

Writer: Otto Binder
Penciller: Curt Swan
Inker: Ray Burnley

Reprinted In:
Superman Annual #6 (1963)

Feature Character(s)

• Superboy (last appearance in Adventure Comics #256; next appearance in Superboy #71)

Supporting Character(s)

• Jonathan Kent (last appearance in Adventure Comics #256; next appearance in Superboy #71)
• Martha Kent (last appearance in Superboy #70; next appearance in Superboy #71)
• Krypto (disguised as the Avenger; last appearance in Adventure Comics #254; next appearance in Superboy #71)

Villain(s)

• King Zarl (no further appearances)

Other Character(s)

• Hercules (first appearance; last appearance in Wonder Woman #105; next appearance in Action Comics #267)
• Samson (first appearance; last appearance in Superman's Pal, Jimmy Olsen #79; no further appearances)

Synopsis:
Superboy is visited by two legendary strongmen, Hercules and Samson. The ancient heroes believe Superboy possesses an elixir that gives him invulnerability. Superboy proves them wrong, but he agrees to travel back in time to assist them with a problem.

A greedy king, Zarl, has hired Samson and Hercules to guard a cave containing his treasure. They have instead returned the treasure to the people. The heroes claim a spirit has prevented them from entering the cave. Superboy likewise claims a spirit is protecting the treasure.

When Zarl grows suspicious he orders, all three into the cave. Inside is an invulnerable Avenger. The Avenger convinces Zarl that his treasure is forever lost to him. When Zarl leaves, the Avenger is revealed to be Krypto in disguise.