Two episodes of the series ("Phantom from the Depths of Time" and "Revolt in the Fifth Dimension") heavily recycle animation from episodes "From Menace to Menace" and "Dimentia Five" of the earlier series Rocket Robin Hood (1966) by simply substituting Spider-Man for Rocket Robin Hood on the animated cels.
Two season were originally commissioned by ABC, previous animated Marvel ventures were little more than basic animation of static images but ABC invested a lot of money in this series, the idea being that this would be akin to Johnny Quest in terms of limited animation. This proved to be too much to cope with as after making just one season the original animation studio, Grantray-Lawrence Animation, filed for bankruptcy. Krantz Films, the company who at the time was acting as distributor, fulfilled the rest of the contract by taking on the animation of the second season themselves, as cheaply as possible, using as many of the assets from their other animated show, rocket robin hood, as possible. A third season was then commissioned to bring the number of episodes up to the syndication standard of 52 episodes and get some of the lost money back from rerun packages.