Adventures of Superman #484 1991

Part 1 of the 5-part 'Blackout' storyline in all the Superman titles. The mysterious Mr. Z returns to Metropolis and, with the help of Professor Hamilton, succeeds in entering the darkest corners of Superman's mind. Unfortunately, a mishap leaves Z and Superman suffering from amnesia.

Notes:

• Martha & Jonathan Kent, Metallo, Mr. Mxyzptlk, and Eradicator cameo flashback appearances.
• Triangle 1991 #37.
• Chronological continuation from Superman #61.
• Chronological continuation in Action Comics #671.