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.