Just remembering the old 60's series, and one of the things that I grew to love about the series was how the series recycled several episodes again and again. They'd alter the animation or change up some scenes, but they often took the same basic elements of the story and reuse them to come up with brand new episodes.
Just off the top of my head, I remember the episode featuring a mad scientist elevating Manhattan into the sky turning into one where it was about a scientist from Atlantis sinking Manhattan, to being merged with an episode about Spider-Man working to stop a prison riot with the same scientist from the first story now returning to take over the city by brainwashing everyone.
Then there was the episode about Spider-Man traveling to a different world when an evil plant was unleashed upon New York City to find some way of stopping it, which was later changed to being just a big out of control seed or just a big bolder.
Then there was the episode where Spider-Man was stuck in the North Pole- which was actually a lush, vibrant jungle for some reason- trying to recover a downed satellite/ space capsule, which was later turned into an adventure of him on a tropical isle trying to recover a downed alien spacecraft.
And there was the episodes where he had to travel underground to stop creatures from under the earth from abducting entire buildings, which I am sure was recycled a couple of times.
And who could forget the episode featuring The Fifth Dimension, which was later used by Rocket Robin Hood (or which the Spider-Man series later used, I'm not sure which series came first) and which featured this character, Infinata:
I'm not going to lie- I love that design. I think it'd be funny/ awesome if he managed to come back to the books to serve as a Spider-Man villain.