It turns out the idea to make the spider that bit Miles Morales come from another universe came from long-time Spider-Man comic writer Dan Slott.
In Into the Spider-Verse, you might have noticed that the spider that bit Miles glitched out a touch, much like how the rest of the Spider-People do. It would be fair to think that this was setup for what later came to light in Across the Spider-Verse, where it turns out this spider was from another universe. As it turns out though, that particular plot point wasn’t actually thought of for the first film – and in a recent interview with Popverse, Slott shared that he was the one that came up with it.
“I gave them the beat that was the 42 spider,” Slott said. “I said to them in a note that the spider that bit Miles glitched, that meant by your rules, it had to come from another dimension. They didn’t have this, they just thought it looked cool to have the spider glitch in the first movie.
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