1. Stir together 1 cup fudge topping and whipped topping in medium bowl until well blended; spread in prepared crust. Place remaining 1/4 cup fudge topping in small microwave-safe bowl. Microwave at HIGH (100%) 15 to 30 seconds or just until warm. Drop by spoonfuls on top of pie; using knife or metal spatula, draw through topping for marbled effect.
2. Cover; freeze 6 hours or until firm. Cover; freeze leftover pie. About 8 servings.
FLAVOR VARIATIONS: Since thickness of fudge toppings vary, follow the directions below for your favorite flavor HERSHEY'S Toppings in pie:
Place pie in freezer. After pie begins to freeze, drop remaining amount listed below of fudge topping by spoonfuls on pie; swirl, store and freeze as directed above.
FAT FREE HOT FUDGE: Use 3/4 cup for pie; use 2 tablespoons for top.