Ever played Revenge of Shinobi? If you haven't, play the superior sequel, Shinobi III, instead. If you have, then, I'm pretty sure you saw the various cameos in the game: Spider-Man, Batman, Rambo, godzilla, and so on. They were a pretty neat addition to an overall average game. These appearences got me thinking..... we need a new Shinobi game where Musashi is pitted against an all new cast of cameos. I've got a few suggestions, all of which are pretty fucking awesome:
Alf
There's not much he can do, actually. But, come on, it's Alf! He could probably crash a spaceship into Musashi if he wanted to. And I hope Joe doesn't have a cat.
The Rock
With his super, uncanny ability to smell (especially things that he's cooking), the ninja master will have a hard time sneaking up to this guy. If he does, then he better watch out for The Rock's eyebrow crushing technique that will DESTROY Musashi. Oh, yeah, he can also wrestle.
King Kong
This giant creature MIGHT appear intact, but don't be surprise if you end up seeing a skeletal or robotic version, instead.
Mr. T
Man, this will be the fight of the century if these two clash. Joe Musashi will have a tough time approaching him without being pitied a thousand times. Even then, if he managed to get close to Mr. T, he'll have to dodge his incredible, helluva throw. It's probably the most dangerous move in existence.

Yes...... YES!! Are you reading this, SEGA? This will be the greatest game ever if you decide to make it. Trust me, it'll sell like hotcakes. All I want is that you credit me as the person who thought up this awesome idea.