Superboy #136

Superboy #136 from 1967 presents a striking cover by penciler Curt Swan and inker George Klein, showing a stricken Superboy crouching in anguish before a row of glowing green statues — labeled as his Kryptonian ancestors Jor-El, Val-El, Sul-El, Hatu-El, and Gam-El — while his loyal dog Krypto lies collapsed at his feet. A speech bubble reveals the terrible trap: a lead coating on the sculptures is melting away, exposing deadly Kryptonite beneath. As a bonus, the issue also features a story by writer Otto Binder with art by Curt Swan and John Forte sending Superboy on an adventure to the 50th Century — a solid package of Silver Age storytelling at its most inventive.