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Historical significance: First appearance of Spider-Man (Peter Parker). Key events: Peter Parker gets bitten by a radioactive spider and gains spider-like powers, beginning his journey as Spider-Man.

Historical significance: First appearance and origin of the Hulk (Bruce Banner). Key events: Bruce Banner is exposed to gamma radiation and transforms into the Hulk.

Historical significance: First appearance of Hal Jordan as the Silver Age Green Lantern. Key events: Hal Jordan is selected by the dying alien Abin Sur to become a Green Lantern.

Historical significance: First appearance of the original Avengers team. Key events: Several superheroes come together to form a team after battling Loki.

Historical significance: First appearance of Thor. Key events: Dr. Donald Blake discovers his alter ego as the Norse god of thunder, Thor.

Historical significance: First appearance of Barbara Gordon as Batgirl. Key events: Barbara Gordon dons the mantle of Batgirl and begins her crime-fighting career.

Historical significance: Launch of the Marvel Age of comics and the first appearance of the Fantastic Four. Key events: The origin of Fantastic Four and their transformation into superpowered beings after cosmic ray exposure.

Historical significance: The first crossover between the Justice League of America and the Justice Society of America, deepening the multiverse storyline. Key events: Heroes from Earth-One and Earth-Two join forces.

Historical significance: First appearance of Iron Man (Tony Stark). Key events: Tony Stark creates his first suit of armor to escape captivity and becomes Iron Man.

Historical significance: The 'Flash of Two Worlds' story, which introduced Earth-Two and the multiverse concept into DC comics. Key events: Silver Age Flash (Barry Allen) meets Golden Age Flash (Jay Garrick).

Historical significance: Introduction of the 'New Look' Batman by editor Julius Schwartz. Key events: Initiated a modernized version of Batman and distanced the character from the campier themes of the 1950s.

Historical significance: First appearance of the Justice League of America. Key events: Superheroes band together to form a team to combat a common threat.

Historical significance: First appearance of Supergirl (Kara Zor-El). Key events: Kara Zor-El arrives on Earth, revealing her ties to Superman as she becomes Supergirl.

Historical significance: First appearance of the X-Men including Cyclops, Jean Grey, Iceman, Angel, and Beast. Key events: Introduction of the mutants and the concept of the Xavier's School for Gifted Youngsters.