About 55 years ago, I recall a comic book in which Superman's son is genetically enhanced by a mad scientist or something and becomes super-intelligent and a villain.
The story ends with Superman using Kryptonite to actually damage his son's brain so that he becomes "normal."
Does anyone remember this story? If so, is it non-canon? I do not even know if Superman canonically has a son let alone this strange episode with poisoning him.
A detail I should add to make the story easier to identify is that Superman rigged a puzzle that the kid solved and this triggered the release of Kryptonite gas.