Billy grew up in the Far West, lulled by the captivating stories of his dad, a former adventurer. He already has his Cowboy outfit and above all he has his desire, as big as he is, to experience the great adventure in this fabulous playground that extends its arms to him every morning: the Wild West! So he takes with him his inseparable friend Jean-Claude, the earthworm, and his accomplice Suzie, the little ferret, and off we go!