Jack the Digger used to be the supervisor of a uranium mine. One day, when he was touring the mine because of an inspection, a tragic accident occurred that buried him and many workers underground. Jack can't quite remember what had been happening down there, but it is certain that he spent months below the surface, until onw day, he had finally dug himself out all by himself. Only when he stood in the blinding light of the sun did he become aware of the changes that had happened to him. He had transformed into a superstrong, but frightening monster, able to dig through the hardest stones and even concrete with ease. Being partly a beast himself, it didn't take long until Gore-Rilla the Ringmaster found him and introduced him to the BEAST-Circus, and later the LUUG.