Earth-2 Justice Society vs. the Avengers
Well, people. We must prepare for the extinction of "Pre" and "Post". Because after Infinite Crisis (actually more like NOW), such distinctions are no longer acceptable. So I'll start.
Lineup:
Superman
Wonder Woman
Wildcat
Flash
Dr. Fate
Hourman
Dr. Midnite
Power Girl
The Huntress
Robin
Star-Man
Hawk-Man
Mr. Terrific
Johnny Thunder
The Spectre
Atom
Captain Atom
Sandman
Green Lantern
Avengers Lineup:
Captain America
Thor (Normal)
Iron Man
Black Panther
Sersi
Doctor Strange
Spider-Man
Hercules
Swordsman
Firestar
Quicksilver
Hulk
Wasp
Giant-Man
Justice
Wonder Man
Black Widow
The Thing
No prep. No PIS/CIS. Featureless environment.