Quite a bit of history led up to Action Comics #1000.
It started with a #1, by Jerry Siegel and Joe Shuster, back in June, 1938, who even got to be special stars of issue #554.
It went through 9 previous centennial special anniversary issues, all of which featured a Superman with red trunks!
#100 #200 #300 #400 #500 #600 #700 #800 #900
As well as so many issues in between....
It premiered villains like the Parasite and Faora Hu-Ul of the Phantom Zone, as well as Superman's cousin, Supergirl, who had 4 Giants in Action Comics devoted to her!
Outpaced Detective Comics, to take the lead of DC Comics' issues.
What will happen in the next 1000 issues?