Madame Web reveals to Spidey that she and the Beyonder have been training 5 different Spider-Man, besides himself, in order to save one of the Spidey's world. They are: a billionaire Peter Parker who wears the Spider-Armor, a powerless Spider-Man, Six-Armed Spider-Man, Octo-Spidey, Scarlet Spider, and Spider-Carnage. Anyway, Spider-Man finds himself in yet another dimension, thanks to Madame Web, where he meets... himself, an exact duplicate of Peter Parker, or, better known as Spider-Man. It seems that in this dimension, a Spider-Clone was created by Miles Warren, but he fled his lab. In this reality, the current Spidey found out about the clone, and reason led himself to believe he was the clone. So, the real Spidey of that dimension dyed his hair blond and called himself the Scarlet Spider. The other Spidey, the clone, went to work for the Kingpin, and Smythe. Later, the Spider-Clone used the Time Dimensional Accelerator to open a portal to another world, but unfortunately became bonded with the carnage symbiote, who was trying to escape Dormammu's world. Later, Spider-Carnage plunders New York and destroys the Daily Bugle, with the other Spidey's right behind him. All of the Spidey's, except for the powerless one, attack Crime Central, only to be surprised by the Green Goblin and Hobgoblin. A battle begins, in which Six-Armed Spidey is transformed into Man-Spider, and he attacks the real Spidey and Scarlet Spider, while Armor Spidey is transported back to Madame Web's base. The episode ends with the Scarlet Spider and Spider-Man caught in the grip of the Man-Spider.
Recap from DRG4's Spider-Man the Animated Series Page