Comic Title: Superboy #109
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: December 1963
On Sale Date: October 3, 1963 Newsstand Date October 3, 1963
Source: House Ad, Adventure Comics #314, Page 10

Copyright Date October 3, 1963
Source: Library of Congress, Periodicals 1963

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

Title: "The Super-Dog That Replaced Krypto"
Pages: 13

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

Writer: Jerry Siegel
Artist: George Papp

Feature Character(s)

• Superboy (last appearance in Superboy #109; next appearance in Adventure Comics #315)

Supporting Character(s)

• Krypto (last appearance in Adventure Comics #314; next appearance in Superboy #110)
• Jonathan Kent (last appearance in Superboy #109; next appearance in Adventure Comics #315)
• Martha Kent (last appearance in Superboy #109; next appearance in Adventure Comics #315)

Villain(s)

• Jax-Ur (last appearance in Adventure Comics #313; next appearance in Superboy #111)
• General Zod (last appearance in Adventure Comics #293; next appearance in Superboy #189)
• Three unnamed Phantom Zone criminals (no further appearances)

Other Character(s)

• Swifty (last appearance in Superboy #105; no further appearances)
• Bizarro-Swifty (no further appearances)
• Lana Lang, Pete Ross, and Krypto robots (no further appearances)
• Humans and Beast-People of a distant planet (no further appearances)

Synopsis:
Influenced by the mental powers of Jax-Ur and the Phantom Zone criminals, the greyhound Swifty creates a formula giving him super powers and turning him evil. Swifty outduels Krypto in a test of wits, then assists Superboy in bringing peace to an alien world.

Superboy then brings Swifty to a secret cache where he stores trophies and dangerous weapons. Swifty turns on the Boy of Steel and releases a Kryptonite trap. Krypto who is also affected by the Kryptonite has enough strength to activate the duplication machine which creates a Bizarro-Swifty. The Bizarro-Swifty is good and rescues Superboy from the Kryptonite. Superboy then creates an antidote for Swifty removes his powers and evil compulsions. Finally, he fashions a special collar preventing the Phantom Zone criminals from further controlling the dog.