5 Videogame Crossover That Must Happen

There are few things more exciting than seeing your favorite characters from different franchises meet.  Who would win if X and Y fought?  Could X survive in Y's world?  What if there was a threat that only X and Y could beat together?  Crossovers answer the ultimate questions.  So here are five crossover that need to happen.

Contra and Metal Slug:

Here you have two crazy, balls-to-the-wall shooters.  Both games have similar mechanic, most notably the one-hit deaths.  Contra is serious and heavy, whereas Metal Slug is lighthearted and silly.  Still, both games are intense, so a crossover could work whether they go heavy like Contra or playful like Metal Slug.

Mario and Sonic:

These bitter rivals of the 90's have shown up in games together.  This, however, would be something for players to really sink their teeth into.  It could be done like Sonic Generation, providing two distinctive playstyles.  Sonic levels would be fast and intense as you run around Bowser and his bad ass kids.  Mario levels world be slow-paced platforming greatness as you use fire flowers to burn Dr. Robotnik (I refuse to call him Eggman) and how henchmen to a crisp.  It could be fun.

Final Fight and Street of Rage:

Two titans of the side-scrolling beat 'em up meeting together in a glorious mash-up.  Player would be able to choose characters from one series and the bosses would come from the other series.  Imagine Cody trading punches with Axel.  Haggar and Max locking up would be fun to watch.  What about Blaze throwing down with Lucia?  You could use the Streets of Rage angle of using robot clones to justify the confusion and fuel the fighting.  Or how about making a one-on-one fighting game with good guys and bad guys from both series'.  Either one would be sweet.

Dead Or Alive and Ikkitousen:

Yeah.  We all know why this one is here.  Simply take some Ikkitousen characters and plop them into the DOA fighting system.  Ryofu Housen is a must.  This would instantly be the sexiest fighting game ever made if it happens.

Dead or Alive vs Tekken:

This would be awesome.  They could make two versions.  A fast, bouncy DOA version and a slow, strategic Tekken version.  They could make the games even more different by including different characters for each version.  It'd be brutal, head-breaking action on both sides.  Namco.  Team Ninja.  Please make this happen.  Please take my money while you're at it.

Obviously, there are other crossovers, but the list would never end if all of them were to be named here.  Feel free to name any you think were missed or deserve a mention.