Heat oven to 250°F. In large bowl, combine popcorn, cereal, crackers, cracker sticks and peanuts. Set aside.
Place margarine in 13x9-inch pan. Place in oven until melted. Remove pan from oven. Stir in seasoned salt, garlic powder and Worcestershire sauce. Drizzle margarine mixture evenly over popcorn mixture in bowl; toss to coat. Place popcorn mixture in same 13x9-inch pan.
Bake at 250°F. for 1 hour, stirring every 15 minutes. Cool 1 hour or until completely cooled. Store in tightly covered container.