You will Watch Ultimate Spider-Man Season 4 Episode 20 online for free episodes with HQ / high quality. Stream cartoons Ultimate Spider-Man Episode 98 On Halloween Night, Spider-Man tries to go trick-or-treating when a strange magic engulfs Manhattan turning every trick-or-treater into what they are dressed as. Spider-Man visits Doctor Strange who states that the spell responsible is on a quantum level. Spider-Man and Doctor Strange end up enlisting Ant-Man in order to go to the Quantum Realm to find the source of the spell. Once there, Spider-Man, Doctor Strange, and Ant-Man find that a reassembled Baron Mordo who attacks with illusions of Dormammu, Ultron, Doctor Octopus’ nanite-enhanced form which is just the beginning of his plot.