When 10-year-old Danielle ("Danny") MacIntyre hears a voice coming from the snowman she just built, she wonders if she's imagining things. She soon learns that what is talking to her is a water molecule - one that really needs her help. For all of his "life," he has never been part of anything big: A little snowstorm here, a sprinkle there. He wants a good story to tell the other, snooty water molecules when he evaporates and goes back up into the sky. He wants to go out "in a big way."
With the help of Danny and her mother's spaghetti pot, the molecule is able to evaporate after washing the face of Danny's little sister. After a tearful goodbye with Danny, the molecule evaporates, but has a great story to tell in the sky.