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John Semper, Jr. was story editor, producer, and writer for Spider-Man, the second longest animated series based on Marvel Comics. He also wrote The Incredible Hulk episodes "Mind Over Anti-Matter" and "Fashion Warriors".

Semper studied Visual and Environmental Studies at Harvard earning a Bachelor's Degree in 1975. One summer he worked on the documentary Gimme Shelter alongside future Star Wars creator George Lucas. He then taught filmmaking and film history at the New England School of Art and Design before moving to Los Angeles. He directed a short film that combined live-action and animation that played as part of the Universal Studios Studio Tour and was donated to the Smithsonian Institute. He then went to work at Hanna-Barbera where he worked on The Smurfs, Snorks, and various Scooby-Doo series.

In 1994, Marvel hired Semper to be the story editor of Spider-Man, essentially running the series. He replaced another story editor, who was not working out, and had worked with Stan Lee before. Semper stated that it was an enormous deal as Marvel Comics was facing severe financial difficulties at the time and Avi Arad needed the series to succeed to help his newly created company Toy Biz. Semper fought with Arad throughout the course of the series as he wanted a quality series but Arad wanted a toy commercial. Semper would usually win by arguing that a quality series would sell toys anyways.

Due to backlash from Power Rangers and Batman: The Animated Series, Semper had to deal with some extreme censorship. He was still allowed to use characters such as Carnage, Punisher, and Blade but had to tone down their actions. He was also not allowed to use Sandman or Electro due to a film being made by James Cameron, but when the film fell through he used Electro. Semper was told not to use season-long story arcs, but did them anyways starting with Neogenic Nightmare. He wanted to emulate the long-form stories from the comics and accomplished it before anyone knew what he was doing. Despite writing some stories for a sixth season, the series ended after the fifth season.

Following his work at Marvel, Semper went to work on the shows Extreme Ghostbusters and Rescue Heroes. He worked with Stan Lee Media, Disney Interactive Studios, and translating Hayao Miyazaki films into English. He wrote for DC Comics series Static Shock, but was not allowed to do similar multi-episode stories. He recently worked on an online series named Creeporia combining live-action and animation. He is currently writing for the Cyborg series for DC Comics. He also scans and uploads storyboards of Spider-Man on Facebook and argues for the entire series to be released uncut on DVD.

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