
A group of young mutants--humans with a genetic variation that gives them superpowers and makes them feared by the population at large--begin training at a school for heroes. Their studies are interrupted when they must rescue one of their number from a mad scientist who can enter others' dreams.

Bitten by a neogenetic spider, Peter Parker develops spider-like superpowers. He uses these to fight crime while trying to balance it with the struggles of his personal life.

When research scientist Bruce Banner is blasted with a gamma ray bomb during an experiment gone wrong, he develops a dangerous alter ego -- a mean, green monster known as the Incredible Hulk -- who emerges when he gets angry.

Industrialist Tony Stark leads a private team of superheroes as Iron Man against the forces of evil.