Flash Comics #21 (1941)

Flash Comics #21 (1941) features the first appearance of one of the most iconic characters in comic book history: Green Lantern. The story follows test pilot Alan Scott who discovers a mystical lantern with incredible powers after surviving a train crash. Using his new abilities, Scott dons a green costume and becomes the superhero Green Lantern, fighting against evil and injustice. Along with the debut of Green Lantern, this issue also includes the adventures of The Flash, Hawkman, and Johnny Thunder. Flash Comics #21 is a must-have for any serious comic book collector and marks a significant moment in the history of DC Comics.