Prepare graham cracker crust: mix sugar and melted butter or margarine with graham cracker crumbs until mixture is crumbly. Place crust mixture in pie pan, pat firmly on bottom and sides of pan, place crust in freezer until remainder of ingredient are prepared.
In medium mixing bowl, add condensed milk and lemon juice, stir together well. Add extra creamy Cool Whip to lemon and condensed milk mixture. Blend on medium for about 2-3 minutes or until mixture is creamy and forms peaks. Place pie mixture in cooled pie crust.
Cool pie crust in freezer for (20) minutes. Allow pie to chill in refrigerator for at least 2 hours.