Oreo Surprise

1 regular pack Oreo cookies
1 cube margarine
1 small jar hot fudge topping
1 8 oz cool whip (thawed)
1 1/2 gallons vanilla ice cream (partially softened)

Crush 2 rows of Oreo cookies and mix with melted margarine. Press into the bottom of a 13x9 inch pan. Layer softened ice cream over crust. Pour 2/3 jar of hot fudge over ice cream. Spread cool whip over hot fudge sauce. Rough chop the last row of Oreo cookies and sprinkle on top. Freeze 2-3 hours before serving. Serve with a drizzle of remaining hot fudge sauce if desired.