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Which Marvel superheroes were introduced during the early 1960s?

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Christopher Reeve as Superman flies over a city at night, wearing a blue suit with a red cape and yellow belt, from the 1978 film Superman. — Superhero Christopher Reeve in *Superman* (1978).

During the early 1960s, Marvel Comics introduced a wave of innovative, flawed, and complex characters that defined the "Marvel Age" of comics.1

Key Marvel superheroes introduced during this period include:

The Fantastic Four: Debuting in Fantastic Four #1 (November 1961), this team consisted of Mr. Fantastic, the Invisible Woman, the Human Torch, and the Thing.12
The Incredible Hulk: This gamma-irradiated character first appeared in 1962.13
Spider-Man: Peter Parker made his debut in Amazing Fantasy before launching his own series, The Amazing Spider-Man, in March 1963.14
Other notable characters: Throughout the early to mid-1960s, Marvel also introduced Thor, the occult-based Doctor Strange, the sightless hero Daredevil, and the X-Men.1

Additionally, Golden Age characters such as Captain America and the Sub-Mariner were rejuvenated and integrated into this burgeoning universe during the same era.13