Quote:
Originally Posted by rkbrown419
You could add Superman at power levels closer to what he had when first introduced. If memory of various stories about the character serves he would have DR strong enough to resist small arms fire not anti tank weapons, ST strong enough to pick up a car and could vertically jump to the top of a skyscraper or leap between them but not fly. Many of the other powers, heat/x-ray vision, super speed came along later.
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X-ray vision was seen as early as the second Superman carton from the Fliescher brothers.....
http://www.imdb.com/title/tt0033888/?ref_=tt_rec_tt
..... and it might have been earlier in the comics. So it's pretty early. It definitely predates flying. That may have come along about a year later (in the cartoon series at least).