Pint-sized cars live and play in a life-size forest in this live-action series. The remote-controlled vehicles -- Zack, Lily, Rex and Axle -- take part in adventures that see them crossing streams, building dams and exploring meadows. Although they may be small objects in a big world, the friends approach every potential problem with enthusiasm and use their mantra, "try, try again," to overcome any obstacle that is put in front of them.