Four very unequal children at the age of 6 until 11 are chosen to become the new soap box racing team to compete at the secret "Castle", where all the world champions of racing have participated, when they were kids. A selective group of boys and one girl have nothing in common but their passion for cars and racing. Their first big challenge is to unite as a team by becoming friends, only then they will have a chance of winning.

The V8 team beat the Barracudas and came one step closer to getting to train at the legendary "Castle" where elite children learn racing skills, but Robin's father has caught onto their illegal street racing and disapproves. Their rivals are the Nitros, a group of competitive girl racers, who kidnap Robin and convince him to join their gang. What will the rest of the V8 team do when they have to compete against one of their own? Will Robin's father shut the whole contest down--Dashing the dreams of both teams?