I definitely agree with Ray Park as Snake Eyes, he does silent martial arts type perfectly, I think I would go with someone different for Scarlett as well, not really sure who though. Willem Defoe or Gary Oldman as Cobra Commander would work for me, and Gerard Butler as Destro, finally an actor that could portray him with the proper scottish accent.

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SILENT DUSTY

"...but for a soldier his duty is plain. He is to obey the orders of all those placed over him and whip the enemy wherever he meets him."
- General Ulysses S. Grant