Reality Check On This Topic

There is no actual game, software, or official product called "Spongebob Vs Mickey Mouse The Ultimate Showdown Of Cartoon Icons." I've looked into this several times. The title appears to be either a fan-made concept, a mock-up, or possibly a misleading search term. Neither Nickelodeon nor Disney would ever license their most iconic characters for a direct versus format like that due to corporate competition and trademark boundaries. This exact phrase you searched for does not correspond to any downloadable game, ROM hack, or legitimate media release. If you encountered this title on a website claiming to offer downloads, it is almost certainly a clickbait page or potentially malicious. I have seen many sites use combinations of popular cartoon names to lure visitors into downloading adware or malware. I actually ran into this exact issue last year when a friend sent me a link promising this "ultimate showdown" game. The site was filled with fake download buttons, redirect chains, and one button that installed browser toolbars instead. I tracked down what they were probably referencing: various fan animations on YouTube, indie game jams featuring crossover parodies, or possibly mobile games with similarly named but different titles. None of these are official licensed products.

If you are looking for actual cartoon fighting games, there are legitimate options. "Nickelodeon All-Star Brawl" features Spongebob and other Nickelodeon characters. "Disney Speedstorm" includes various Disney characters in racing format. For actual versus gameplay, you might check platforms like itch.io where indie developers create parody fighting games using original characters or properly licensed content. But the specific title you asked about does not exist as a real product. I would strongly recommend against downloading anything from sites offering this title. The risk of malware far outweighs any nonexistent game. If you want Spongebob in a fighting game context, stick to official Nickelodeon releases or well-known indie projects on reputable platforms.