I think he first appeared in 1959 (I lost the book that had it in there), from the cover, it looked like he came from a race of electrical beings that were asking for Superman's help, but I don't know that they ever used him again.
slaps forehead:
http://www.comics.org/coverview.lasso?id=15978&zoom=4I have that story!
It's part of Showcase Superman Vol.2.