15 issues of the Post-Crisis reboot of Action Comics (plus the first annual) in which Superman teams up with different DC heroes in every episode. Does not include issues 588 and 589. Features the debut of Checkmate and team-ups with the Teen Titans, Legion of Super Heroes, Batman, the Martian Manhunter, the Demon, the Spectre and Wonder Woman among others.

I also have listings for the Superman and Adventures of Superman issues for the same publication period.