Meet Matildas star goalkeeper Mackenzie Arnold as a kid and follow her football and friendship adventures. Mackenzie Arnold loves playing football with the Seaport Strikers. She's now the team's goalkeeper and is starting to like it. But when a classmate bets Macca that she can't keep a clean sheet against the Strikers' strongest competitors in the biggest game of the season, can she come through? A new friend and teammate from Argentina brings added skill to the team, but not everyone is happy. Can Macca bring the team together and stop the ball getting past her?