Chameleon (comics)
The Chameleon (Dmitri Smerdyakov) is a fictional character, a supervillain appearing in American comic books published by Marvel Comics. Commonly depicted as a master of disguise and the half-brother of Kraven the Hunter, the Chameleon is known as being the first supervillain for Spider-Man to face by first appearing in the original issue of "The Amazing Spider-Man".
Chameleon (comics)
The two encountered Chameleon at Peter's high school (Chameleon had murdered the principal and was posing as him), where Chameleon reveals that he wasn't human at all but a giant monster. Chameleon was finally defeated, however, after Spider-Man (of Earth 616) used Spider-Man 2211's helmet to literally "administer poetic justice", causing a last-minute body switch between Chameleon and Sandman's father into an electric chair.