Originally posted by mrsMxyzptlk:
Mostly, Superman seems to be vulnerable to whatever the plot calls for. 
This is true, but at least if "Return of the Prankster", Superman was still vulnerable to light in the same way he had been in "The eyes have it". They never explained why Lois stopped leaking information, but at least they did keep a little continuity.
This also made Clark seem prideful in being convinced the device would not work on him.
