In a chilled medium bowl, add the cream and sugar and beat with a mixer until stiff. Cover and set in the ice box.
In a large bowl beat the milk, pudding mix, and condensed milk until slightly thickened, about 5 minutes.
In a small bowl, mash 1 very ripe banana with a fork until smooth. Beat the mashed banana into the pudding mixture. Cover and refrigerate for about 20 minutes or until it reaches a thick pudding consistency. Meanwhile, thinly slice the remaining bananas
Place half of the vanilla wafers in the bottom of a 9 by 13 baking pan.
Fold half of the whipped cream into the pudding mixture. Evenly spoon the pudding mixture over the vanilla wafers, then layer the sliced bananas and remaining whipped cream. Crumble the remaining nilla wafers and spread over the top.
Cover and refrigerate for 20 minutes or until you are ready to serve.