Which was your first Superman comic book?
The first issue that I've ever read was the Italian edition of JIMMY OLSEN 66 (1963), 13 years ago.
It was a story which featured a hoax by Jimmy and Superman planned to frame criminals making believe them that Red Kryptonite turned Supes in a devilish being with horns and red skin. I didn't like it so much when I first read it (I was 9).
This is the cover.
The same book contained other stories with Batman, Martian Manhunter and Superboy. I'd like to know where appeared this story in the USA... The publisher didn't use to indicate the provenience of the stories.
The story was entitled "Agonia" ("Agony" in English; maybe the Italian title wasn't a literal translation), and featured the origin of the Green Kryptonite, founded by Pa Kent in Smallville. Jonathan gifted the rock to his son, that could die for the radiactions. Then, Clark discovered that his Superboy Robots could stop the radiations and so he put the rock inside one of them (the one called Friday). Do you remember this story?