In a medium bowl, mix 3/4 Italian dressing, cayenne pepper, melted butter, black pepper, Creole seasoning, and garlic powder.
Rub over turkey, using remaining Italian dressing to fill cavity. Allow turkey to marinate 24 hours for best flavor.
NOTE: I have also brined the turkey for about 12 hours
before marinating it with the rub; approximately another 12 hours in the refrigerator.