I can't believe I missed seeing Superman! He's such a... hunk! 
Superman (Volume 2) #20 is an issue of the series Superman (Volume 2) with a cover date of August, 1988.
Synopsis for "Doom in the Heartland!"
Superman and the Doom Patrol fight Metallo.
Appearing in "Doom in the Heartland!"
Featured Characters:
Supporting Characters:
Antagonists:
Other Characters:
- Alice
- Baron Sunday (Behind the scenes)
- Cat Grant
- Janet Jones
- Jimmy Olsen
- Jonathan Kent
- Lana Lang
- Lois Lane
- Maggie Sawyer
- Martha Kent
- Milton Fine (Behind the scenes)
- Perry White
Locations:
Items:
Vehicles:
Notes
- The Doom Patrol appeared last in Doom Patrol (Volume 2) #10. They appear next in Doom Patrol (Volume 2) #11.
- The character Janet Jones is only referred by surname in this issue. Her first name is known in Adventures of Superman Vol 1 438. She seemingly is not the former wife of Nightmaster.
- This issue is reprinted in Superman: The Man of Steel Vol. 4 (2022 Edition).
Trivia
- Superman last met the Doom Patrol in DC Comics Presents #52. Although that story took place in the Pre-Crisis continuity, it (or similar events) seems to have still happened Post-Crisis, as Superman is still familiar with them.