Comic Title: Superboy #49
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: June 1956
On Sale Date: April 5, 1956 Copyright Date April 3, 1956
Source: Library of Congress, Periodicals 1956
Until 1958 DC did not report actual on sale dates to the copyright office
The publication dates listed in LoC records are NOT release dates.

Newsstand Date April 5, 1956
Source: Newsdealer Magazine, V11 #2

Frequency: Monthly, with the exception of Feb., May, Aug., and Nov.
Cover Price: $0.10
Page Count: 32
Editor: Mort Weisinger

Title: "Metallo of Krypton"
Pages: 8

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

Writer: Jerry Coleman
Artist: John Sikela

Feature Character(s)

• Superboy (last appearance in Superboy #49; next appearance in Adventure Comics #225)

Other Character(s)

• Metallo (a Kryptonian robot; no further appearances)
• Two unnamed astronomers (no further appearances)

Comments:
This story is recycled in the first story of Adventure Comics #276.

Synopsis:
While in outer space after handling an emergency, Superboy becomes trapped on an asteroid. A Kryptonite cloud surrounds the asteroid and prevents him from escaping. He soon discovers another inhabitant of the asteroid, a robot named Metallo. Superboy learns that Metallo was created on Krypton. Metallo serves Superboy and helps him build a lead shelter. Then while Superboy is asleep, Metallo sacrifices himself to construct a rocket for Superboy which can propel him past the Kryptonite cloud barrier. Superboy is able to return to Earth where he constructs of memorial to his fallen robot friend.