Chameleon (comics)
The Chameleon was born a Soviet citizen named Dmitri Smerdyakov (Дмитрий Смердяков). In his youth, he was a servant and half-brother to Sergei Kravinoff and eventually became a minor associate to Gustav Fiers. Although Dmitri and Sergei were friends, Sergei was often abusive to Smerdyakov, leading to a combination of admiration and resentment towards Kravinoff. Eventually, Smerdyakov emigrated to the United States of America. As he had made a talent for himself during his youth, impressing his brother by impersonating friends and neighbors, he assumed an even more impressive disguise: the identity of Chameleon. During his first known criminal outing, he impersonated Spider-Man, though he was exposed and arrested. Shortly afterward, Kraven the Hunter himself came to America, and the Chameleon set his old associate's sights on Spider-Man. Both men became long-time enemies of Spider-Man, part of his primary rogues' gallery.
Legends of the Superheroes
In the first episode, the Justice League of America (Batman, Robin, Flash, Green Lantern, Hawkman, Captain Marvel, Huntress and Black Canary) unite at the Hall of Heroes to celebrate elderly retired superhero Scarlet Cyclone's birthday. The party is interrupted by the Legion of Doom (Riddler, Weather Wizard, Sinestro, Mordru, Doctor Sivana, Giganta and Solomon Grundy), who announce they have hidden a deadly bomb in a secret location, and the heroes must follow clues to find it. It's all, actually, a trap to make the heroes drink Mordru's de-powering potion, which succeeds, but the heroes face off the villains even so, disarm the bomb and recover their powers. Only after the whole battle is gone, and the heroes have proven victorious, does Scarlet Cyclone arrive to give his aid.