Children's drama. A children's gang in London called The Battersea Bats decide to build a car and enter it in a soapbox derby. A rival gang The Victoria Victors hear about the car and set out to steal it's plans. One of the Bats is thrown out of the gang for dirty fighting so joins the Victors for revenge. They plan things to make it look like it was one of the Bats who stole the car. Watch out for a very young 'Michael Crawford' in his first screen appearance.