Superman #50

Krisis of the Krimson Kryptonite. Part 4 of 4. Special Extra-Sized issue. "The Human Factor!" Cameos by the Guardian and Gangbuster. Superman has been rendered powerless, beaten, and humiliated by his arch nemesis, Lex Luthor. But when Luthor's own arrogance causes him to break the rules of the game set forth by Mr. Mxyzptlk, can a fully restored Man of Steel be far behind? Plus, Lois Lane gives Clark Kent her answer to his marriage proposal.Note: This issue features a humorous cameo by Marvel's First Family - the Fantastic Four.The cover of this issue is said to have been a tribute to the George Reeves version of Superman. Second printing with UPC in lower left corner and ‘Historic Engagement Issue’ at the top