Spray 9x13 baking dish. Pour pie filling into pan & chop apples up. Pour pineapple over...include juice. Spread dry cake mix over top. Pour butter over dry cake mix. Cover & refrigerate overnight or a couple of hours to let mix soak up some of the juices.
Preheat oven to 350. Bake for 35-40 minutes (depending on your oven). Enjoy.
NOTE: This can be made with various pie fillings & fruits...as well as, other cake mixes...to your liking.