X-Men vs. Street Fighter is a crossover fighting game that blended the universes of Marvel Comics' X-Men and Capcom's Street Fighter. The '961004 USA Phoenix Edition' refers to a specific release date and possibly a US regional version or update. This crossover was innovative, combining the distinct fighting styles and characters from both franchises into one exciting game.   Its success likely stemmed from the combination of two already popular fighting game franchises and offered a diverse roster of characters and fighting mechanics.  The specific developer and publisher of this edition would necessitate more in-depth research.

X-Men vs Street Fighter (961004 USA Phoenix Edition)

X-Men vs Street Fighter (961004 Euro)