This issue is a variant of Superman (DC, 1987 series) #21 [Direct Edition].
Corrected cover pencil & ink credits from Ralf H. Kienzle (December 15, 2005).
Story continues in ADVENTURES OF SUPERMAN (DC, 1987 series) #444.
Letters from readers - David Metz, Neil Ahlquist, Stacy Brian Barley, Sam Hatcher, Mark Glinskie, Ed Moretti, R.K., Paul Anthony Lhossas, Bob Clinton, Carlos Pico, Jr., Tim Moyle and Howard T. Kodd - and responses from Renee Witterstaetter. Preview of cover to ADVENTURES OF SUPERMAN (DC, 1987 series) #444.