A deadly assassin stalks the back alleys of the Mushroom Kingdom, as Exploding Rabbit adds a new challenger to popular Flash game mash-up Super Mario Bros. Crossover. Those poor Goombas will never see it coming.

During a recent interview, Crossover creator Jay Pavlina explained that several characters had to be cut from the game's initial release, including Luigi, the SOPHIA battle tank from Blaster Master, and Ryu Hayabusa from Ninja Gaiden.

Now we can mark Ryu off that list.

Yes, the original ninja in all his spinning, wall-clinging glory will be showing up in the 1.1 update to Super Mario Bros. Crossover, and if the video is any indications, he'll be tearing the Mushroom Kingdom a new one. Just look at him. He's completely unbalanced, and it's wonderful.

Now I just feel bad for Dueling Analogs' Steve Napierski, who'll have to go back to the drawing board to add Ryu to his Super Mario Bros. Crossover box art. It's okay Steve, we'll just pretend he's hiding.

Super Mario Bros. Crossover – Ryu Hayabusa Trailer [Exploding Rabbit - thanks Ami!]