Comic Title: Superboy #140
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: July 1967
On Sale Date: May 18, 1967 Newsstand Date May 18, 1967
Source: Direct Currents, Batman #193, Page 79

Newsstand Date May 18, 1967
Source: Newsdealer Magazine, V22 #4

Copyright Date May 18, 1967
Source: Library of Congress, Periodicals 1967

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

Title: "Beware the Mad Dog of Steel"
Pages: 10

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

Writer: Otto Binder
Penciller: George Papp
Inker: Frank Springer

Feature Character(s)

• Superboy (last appearance in Superboy #140; next appearance in Adventure Comics #358)

Supporting Character(s)

• Krypto (last appearance in Superboy #137; next appearance in Superboy #148)
• Jonathan Kent (last appearance in Superboy #140; next appearance in Superboy #142)
• Martha Kent (last appearance in Superboy #140; next appearance in Superboy #144)
• Jor-El (in flashback; last appearance in Superboy #126; next appearance in Superman's Girl Friend Lois Lane #98)

Other Character(s)

• Four Kryptonian trapeze artists (in flashback; no further appearances)
• A Kryptonian animal trainer (dies in flashback; no further appearances)

Flashback Appearance(s)

• Kal-El (last appearance in Superboy #130; next appearance in Action Comics #390)

Synopsis:
While playing tag with Krypto, Superboy discovers a space capsule containing vials on Kryptonian diseases. Krypto is accidentally exposed to Kryptonian rabies. Superboy must flee, since Krypto's bite is now deadly to him. Krypto chases him and manages to bite Superboy's foot before the rabies wears off. Superboy becomes fatally ill, but is saved by another one of the Kryptonian diseases which counteracts the rabies.