The Ultimate Vampire Resource and Directory

Appearing in "Secret of the Superman Sphinx"
Featured Characters:
Superman
Supporting Characters:
Lois Lane
Perry White
Villains:
None
Other Characters:
None
Locations:
Egypt (cover only)
Metropolis
Daily Planet
Items:
Clark Kent Robot
Kryptonite
Superman Robot
Vehicles:
None

Synopsis for "Secret of the Superman Sphinx"
Superman's powers are weakened every ninety minutes when a Kryptonite-eyed Superman sphinx orbits overhead.