Stir boiling water into gelatin in a large bowl until completely dissolved. Mix cold water and ice to measure 1 cup. Combine with gelatin mixture, stirring until the ice melts.
Stir of in 1 tub of whipped topping with a wire whisk until smooth.
Refrigerate 15 to 20 min or until mixture thickens. Spoon into crust and refrigerate for 4 hours or overnight.
Makes 8 servings.