How about for four year olds?

See less than nothing. See less than nothing go "Bang". A Big Bang! A very very big bang! See nothing expand reall really fast. See nothing become very hot. See nothing cool. See nothing become something. Watch out for the entropy monster!! See all the little nothings get together and become stars. See the stars get old a go boom. See some star bits become more stars. See the little star bits become planets. See the little star bits on one planet become plants, then animals then people. See the stars burn out. Entropy monster wins! Everyboby dies. Goodbye.