Well that seems off base since the X-Men TAS already did Jack the Ripper being a mutant created by Mr. Sinister
"A mini-series was actually supposed to take place after the series finale, in which Spider-Man journeys with Madame Web backwards through time to find the missing Mary Jane Watson. He would have ultimately found her in Victorian England with amnesia and she would have been hunted by Carnage, who was also trapped in that time period and was impersonating Jack the Ripper. Once Spider-Man had stopped Carnage and had left with Madame Web and Mary Jane back to the present, Mary Jane would have regained her memory and ultimately admitted to Spider-Man that she had always known he was Peter Parker, which had been hinted at throughout several episodes of the animated series."
That's from the IMDB page of the show. Not sure how much of it is true though or where the info is actually coming from.