Cherry Sheet Cake

1 small box cherry gelatin
1 (18.25 ounce) box cherry cake mix
1 envelope Dream Whip
1 small box vanilla instant pudding
1 1/2 cup cold milk
1 teaspoon vanilla extract

Dissolve gelatin in 3/4 cup boiling water; set aside. Prepare cake mix using package directions. Bake in 13 x 9-inch baking dish. Cool for 20 to 25 minutes.

Pierce cake with fork at 1/2-inch intervals. Pour gelatin over cake. Place in refrigerator. Combine remaining ingredients in deep chilled bowl. Whip until stiff. Spread over cake. Refrigerate for several hours.