Adventure Comics 288 (Sep 1961) VG (4.0)

1" tear at top right corner of front cover

Cover by Curt Swan and Stan Kaye

"War of the Superboys" 

Script:Jerry Siegel

Pencils:George Papp

Inks:George Papp

Characters:
Dev-Em (introduction); Jor-El; Lara (flashbacks); Krypto; Ron-Em; Leeta

Synopsis:
Bad boy Dev-Em escapes Krypton and arrives on Earth