There's something... A penny that just doesn't want to drop... Something... Crazy maybe... Something like... Well... I'll ask you, point blank... Superman... Are you Clark Kent? 
Action Comics #597 is an issue of the series Action Comics (Volume 1) with a cover date of February, 1988.
Synopsis for "Visitor"
Lois Lane visits Smallville following the aftermath of the Millennium crossover story, intent on finding the truth of who Superman really is, when she finds him with Lana Lang, suspecting that he may be in love with her. Lois also meets Clark Kent's parents, who tell Lois that they secretly raised Superman alongside their own son Clark, which makes Lois react negatively toward Superman, suspecting him of hiding a secret.
Appearing in "Visitor"
Featured Characters:
- Superman (Flashback and main story) (from Adventures of Superman #436)
Supporting Characters:
- Lane Family
- Lana Lang (Flashback and main story) (from Adventures of Superman #436)
- Kent Family
- Cat Grant (Mentioned only)
- Jimmy Olsen (Mentioned only)
- José Delgado
Antagonists:
Other Characters:
- Smallville Residents (Unnamed)
- Hotel Clerk (Unnamed) (Cameo) (Single appearance)
- Peg (waitress) (Cameo) (Single appearance)
- Daily Planet Employees (Cameo) (Flashback only) (from Adventures of Superman #436)
- Justice League International (Mentioned only)
- United Nations (Mentioned only)
- Batman (Cameo) (Flashback only)
- Green Lantern (Cameo) (Flashback only)
- Flash (Cameo) (Flashback only)
- Hawkman (Cameo) (Flashback only)
- Martian Manhunter (Cameo) (Flashback only)
- Manhunters (Mentioned only)
- Bill Turner (Phone call only) (left a message on Lois' answering machine)
- Lex Luthor (Phone call only) (left a message on Lois' answering machine)
- Three Nurses (Unnamed) (Cameo) (Single appearance)
- Patient (Unnamed) (Cameo) (Single appearance)
- Combattor (Mentioned only) (from Adventures of Superman #437)
Locations:
- Krypton (Mentioned only)
- World War II (Mentioned only)
- Kansas
- Smallville
- Lang Farm
- Smallville Hotel
- Room 3A
- Smallville Diner
- Cooley's Drug Store (Mentioned only)
- Smallville
- Metropolis
- Daily Planet (Flashback only) (from Adventures of Superman #436)
- Daily Planet Newsroom (Flashback only) (from Adventures of Superman #436)
- 344 Clinton Street
- Clark Kent's Apartment (Mentioned only)
- Lois Lane's Apartment
- Stratford Hotel (Mentioned only) (Bill Turner's message on Lois' answering machine)
- La traviatta (Luthor's message on Lois' answering machine) (Mentioned only)
- Metropolis General Hospital
- Jose Delgado's Room
- Daily Planet (Flashback only) (from Adventures of Superman #436)
- Gotham City (Mentioned only)
- California
- Coast City (Mentioned only)
- Central City (Mentioned only)
Items:
- Batrope (Cameo) (Flashback only)
- Green Lantern Ring (Cameo) (Flashback only)
- Story of the Century (Mentioned only) (from The Man of Steel #2)
Vehicles:
- Lois Lane's Car
- Manhunter Starship
- Kryptonian Rocket (Mentioned only)
Notes
- Superman mentioned that the autopsy report of the Combattor revealed a Mystery Chemical in his bloodstream.
- This issue is reprinted in Superman: The Man of Steel Vol. 3 (2021 Edition).