In an extra large bowl mix together all the cereals, pretzels and peanuts.
Combine the sugar, butter and syrup in a large microwave-safe bowl. Microwave on high for 3 - 3 1/2 minutes until it begins to boil. Microwave 4 minutes on 40% power. Stir in the vanilla and soda.
Pour carefully on top of the cereal/pretzel/nut mix and stir it all up until evenly coated. Place the bowl in the microwave and microwave on high for about 4 - 4 1/2 minutes until it becomes toasted a light brown. Stir, and then spread on waxed paper to cool. When totally cool, break apart into pieces.