Crossover: There's a Supergirl in the post-Crisis DC Universe - but isn't that impossible?!
Superman Reading Order, 1987-1988: The Man of Steel
Comics Chronology: The Man of Steel gets a fresh start after the universe-resetting Crisis on Infinite Earths
Return to Krypton (1988) Reading Order
Crossover: Superman finds out the truth about Krypton's intentions for Earth...
The Secret Revealed! (1987) Reading Order
Minor Crossover: Lex Luthor's search for Superman's secret identity leads him on a darker path
Y2K (2000) Reading Order
Crossover: Brainiac turns Metropolis into a true City of Tomorrow and all it costs is freedom of thought!