taking Betty Brant and May Parker hostage. He has led subsequent Sinister Six groups and usually takes offense when someone else leads the team. Disguised as the Master Planner, he organized theft of atomic equipment. After he stole a formula that Spider-Man needed to cure his Aunt May, Spider-Man tracked Doctor Octopus' gang to their base. In the ensuing fight, Spider-Man became trapped underneath a collapsed building. Seemingly doomed, Spider-Man was ultimately able to draw upon the sheer force of his will to summon the strength to escape. It is later revealed he used a scuba tank to escape. Doctor Octopus later attempts to steal the Defense Department's Nullifier device, and sets a trap for Spider-Man. He became May Parker's tenant, then got close enough to use the Nullifier on Spider-Man; although he had hoped that it would merely nullify Spider-Man's web-shooters, the radiation in Spider-Man's blood resulted in the Nullifier's interaction with Spider-Man's unique biology rendering him amnesiac, Doctor Octopus subsequently tricking Spider-Man into helping him before Spider-Man's own better nature resulted in him turning against his 'partner' despite his memory loss long enough for John Jameson to use the Nullifier to shut down his tentacles. Doctor Octopus later exhibited the ability to activate his mechanical arms remotely, and used them to free himself from prison. His resulting battle with Spider-Man resulted in Captain George Stacy's death. Doctor Octopus later waged a gang war with Hammerhead. He attempted to wed May Parker in order to acquire an island with an atomic plant which she had recently (and unknowingly) inherited. Doctor Octopus escaped death when the island was destroyed in a thermonuclear explosion and began a life as a homeless person. He next battled the "ghost" of Hammerhead, unwittingly returned him to his corporeal form using a particle accelerator and defeated him after forming a temporary alliance with Spider-Man. Doctor Octopus later attempted to hijack an atomic submarine. He also attempted to poison New York City with printers' ink, and battled the Punisher and Spider-Man. He next battled the Owl and his gang. He successfully deactivated a nuclear reactor in a laboratory before meltdown. He later displayed symptoms which Mister Fantastic diagnosed as multiple personality disorder. During the "Secret Wars" storyline, Doctor Octopus was taken to the Beyonder's Battleworld, where he fought a horde of heroes and plotted against Doctor Doom for the leadership of the group of villains. He