Peter Parker was bitten by a radioactive spider while in high school, the spider bite caused him to develop powers and abilities similar to that of a spider. He was soon able to crawl up walls and sense imminent danger, and eventually even developed his own method of creating webs to swing from. Upon the death of his Uncle Ben due to Peter's indifference, Peter decided that 'With Great Power there must also come Great Responsibility', and thus became Spider-Man.
Always the underdog, Peter is routinely out-manned and out-gunned, but still manages to throw in wise-cracks between punches, and usually comes out on top in the end.
Below are all alternate versions of Peter Parker. When referring to Spider-Man, you may also be referring to Ben Reilly (Peter's clone who took up the Spider-Man alias after Peter quit for some time) or Otto Octavius (who took over Spider-Man's body as well as the alias until just recently). Spider-Man may also refer to Miguel O'Hara, the Spider-Man of 2099.
Alternate Reality Versions