"Duel of the Diamond Demons"
The combination of light refraction from a newly compressed diamond and solar radiation cause both Steve Lombard and Superman to change into creatures with diamond skin.
"The Private Life of Clark Kent: The Last Headline"
Perry White has reached mandatory retirement age from the station. Morgan Edge wants him to go out with a bang and gives him a last assignment; track down and uncover a hidden hoard from a crook Perry helped jail years ago.