The true story of Mac: the first chimpanzee in space. Wilhelm von Huber (James Woods) is a NASA scientist who moves to Florida with his son Billy (Alex Linz) after the recent death of Billy's mother. But there's a widening gap developing between father and son because Billy thinks his father is boring and yearns to be with the young astronauts. Then Billy gets his wish when Dr. Donni McGuiness (Annabeth Gish) enlists his help to train the chimps NASA needs for an experimental space flight. Billy's favourite, Mac, is chosen to be first in space but the boy then realises the real risks involved. Can Wilhelm and Billy pull together to ensure a happy outcome for Mac's mission?