"The Last Days of the Man of Tomorrow" is a storyline from the Superman comic series, specifically in Superman: Whatever Happened to the Man of Tomorrow?. It depicts the final days of Clark Kent, also known as Superman, as he faces his greatest challenges and enemies. The narrative explores themes of legacy, sacrifice, and the impact of a hero's choices. In this story, Lex Luthor and other villains threaten Superman, leading to a climactic confrontation. The tale serves as a poignant farewell to the character, showcasing his enduring spirit and the love of those he protects, ultimately leaving a lasting impression on the DC Comics universe.