Secret Origins (1986 DC 2nd Series) #50

It's a 96-page blockbuster final issue of Secret Origins, featuring an illustrated prose retelling of the first meeting between Batman and Dick Grayson, written by Dennis O'Neil and illustrated by George Perez; "The Flash of Two Worlds," as retold by writer Grant Morrison and artists Mike Parobeck and Romeo Tanghal; Black Canary, by writer Alan Brennert and artists Joe Staton and Dick Giordano; Dolphin, by writer Richard Bruning, with art by Steve Bove and Kez Wilson; the origin of the western hero Johnny Thunder, written by Elliot S! Maggin, with art by Alan Weiss and Giordano; and the story of the Space Museum, by writer Gerard Jones and artists Carmine Infantino and George Perez. Cover by Ty Templeton.