Spider-Carnage does not destroy the current world, but he escapes via the Accelerator. Madam Web brings back Spider-Man and the Scarlet Spider to her base and informs the Spider-Men that Spider-Carnage is now in a different dimension. She says she can only send one of them there, and the real Spider-Man says he will go. It seems this time, Spidey winds up in the billionaire Peter Parker's world. It seems in this dimension, the Spidey is engaged to Gwen Stacy, Jonah Jameson is his godfather, Wilson Fisk is his lawyer, and Uncle Ben is still alive. Not to mention the fact that he owns the Peter Parker Science Foundation and his identity is public. Moments later, Spider-Carnage kidnaps Gwen and Armor-Spidey tells the boys that he has a secret weapon since Spider-Carnage is obviously too insane to be reasoned with by him or any of the Spideys. The weapon turns out to be Uncle Ben, since Spider-Carnage lost his Uncle Ben, similar to the way the real Spidey did. Uncle Ben tells Spider-Carnage the rule of power and responsibility, which convinces him to try his hardest to separate from the Carnage symbiote, but it does no good. So, Spider-Carnage does the only thing he can. He used the TDA to create a disintegration portal and kills himself. Then, the powerless Spidey, from the real world, like the one you and me live in, takes Spidey to see a very special man, which is Stan Lee. The real Peter thanks him for creating him and when Stan sees Madam Web, he says "Who is that exotic woman?" The series ends with Madame Web promising Spidey that they will find the real Mary Jane Watson. End of story.
Recap from DRG4's Spider-Man the Animated Series Page