This issue is a variant of Adventures of Superman (DC, 1987 series) #441 [Direct]. There exist further variants.
On-sale date from Amazing Heroes #136.
The spaceship bringing Psi-Phon and Dreadnaught to Earth appears on the final panel in this comic.
Letters from readers - Eric Peterson, Andrew Szumilo, Michael R. Cantrell, Brian Goodman, Joe Frank, Anu Locker, Phil Brown, Jon Mulkern and Kelly Finn - and responses from Renee Witterstaetter.
Jenette Kahn discusses trying to get DC properties made into movies, specifically focusing in on getting Hollywood interested in WATCHMEN, even before it had been written.