Superman #42 1990

Superman #42 (2015) is a pivotal issue in the "Truth" storyline, where Lois Lane definitively discovers Clark Kent's secret identity as Superman. Written by Gene Luen Yang with art by John Romita, Jr., the story follows Clark, Lois, and Jimmy Olsen as they investigate the mysterious HORDR organization. This comic is highly notable to collectors for its significant character development, marking a crucial turning point in Superman's mythology as the events lead to his identity being publicly exposed.