A girl named Gloria Alpert mistakenly believes that she is Clark Kent's sister from the planet, Krypton. She stays at the Kent farm until such time that Superboy discovers the truth.
Professor Lang discovers an ancient cursed idol. Whenever it is within the presence of something green in color, it begins radically altering the weather. Superboy makes numerous attempts to halt the idol's effects. Eventually, he uses his own costume to render the curse inert.
Notes
"The Story of Superboy's Sister" is reprinted in Superman #222. In that issue, the story is re-titled as "The Secret of Superboy's Sister".
"The Super-Clown of Smallville" is reprinted in Best of DC #7.