In the lead up to the 1956 Olympic games, a group of missionaries are tasked with helping the fledgling Australian basketball team compete in their first ever Olympics, and in doing so, unite a nation still coming to grips after the war.

Marco, Tato, Serena, and Leo are nine years old, and they are inseparable friends, ready to defend each other from their schoolmates’ bullying. On the evening of Marco's birthday, all four find themselves together to blow out the candles and unknowingly make the same wish: become adults. In one night's time, they find themselves magically the same age as their parents, but with the same behaviour and thoughts they have as kids.