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Originally posted by KenJ:
If you're talking about Cap. America, I'll have to go back and look at it again.

There were a couple of runs of Amalgam comics which was a joint effort between Marvel and DC.
Actually it fits Cap.

Kal stopped thee explosion at the Luthor facility and was found unresponsive. Which is a story unto itself as there was no K.

Luthor came and suspected the inert form was some kind of German experiement. A super-man.

He tried to dissect "it" but nothing would cut through the exterior "skin".

Short of being able to do that Luthor wanted to preserve "it" and used a cryo technology to preserve the seeming man-like speciment.

Did Luthor ever learn more? About kryptonite which could have cut into Kal? Or not?

All part of the story.