Krypto Mouse
From superman.nu: Supermanica
Revision as of 19:54, 2 March 2005 by 209.158.251.54 (Talk)
Krypto Mouse was a little boy's pet mouse who grew large and gained super powers but kept his mouse personality.
(SB No.65 July 1958 "“The Amazing Adventures of Krypto-Mouseâ€)