Doctor Octopus

Otto Octavius was a brilliant scientist and inventor before an accident bonded him to four mechanical tentacles driving him to extreme criminal activities. Taking the name Doctor Octopus, Doc Ock for short, he became one of Spider-Man's most formidable opponents, founded the Sinister Six, and took over the criminal underground as Master Planner.

He is a major antagonist of the series, appearing in the first season as a minor antagonist of the Biology arc, one of the secondary antagonists of the Economics arc, one of the secondary antagonist of the Chemistry arc and a minor antagonist of the Psychology arc and in the second season as the main antagonist of the Engineering arc and the secondary antagonist of the Criminology arc.

Physical appearance
Otto Octavius is a caucasian male with short small build, with brown hair and brown eyes. He wore a green vest, with a yellow buttoned shirt underneath, a orange bowtie, a scientist coat, brown pants, brown shoes and sported square glasses.

Personality
Before he became infused with the tentancles, he was very timid and was willing to apologize for every little thing, in contrast to Norman Osborn.

Background in other media

 * This is Doctor Octopus' fifth animated appearance. Previous versions include Spider-Man (1960),  The Incredible Hulk, Spider-Man and His Amazing Friends, Spider-Man (1990) and Spider-Man Unlimited.