PREHEAT oven to 350°F. Mix graham crumbs and butter until well blended. Press firmly onto bottom and up side of 9-inch pie plate. Bake 10 minutes or until lightly browned. Cool completely.
SPREAD fudge topping carefully onto bottom of crust. Top with ice cream; cover. Freeze 5 hours or until firm.
REMOVE pie from freezer when ready to serve. Preheat broiler. Place marshmallow halves, cut sides down, on top of pie. Broil 4 inches from heat 2 minutes or until marshmallows are golden brown and puffed. Serve immediately.