 Simon's body is old and diseased and Roger enables him to continue doing research by transplanting his healthy brain into an artificial case (originally immobile—carried around by Grag—later equipped with lifter units).Working together, the two scientists create an intelligent robot called Grag, and an android with shape-shifting abilities called Otho.One day, Corvo arrives on the moon and murders the Newtons; but before he can reap the fruits of his atrocity, Corvo and his killers are in turn slain by Grag and Otho.