Grath is a Scarran interrogator. While John Crichton is visiting a commerce planet, he abducts the human and takes him to an underground interrogation chamber. There he puts Crichton through a device that induces delusions meant to break Crichton's mind. Little does Grath know, however, Crichton has an ally with him inside his own head, Scorpius' neural clone. The clone causes all brain activity in Crichton to stop, making Grath believe that he is dead. With the Scarran's attention turned away from what he believes is a corpse, the revived Crichton sets his pulse pistol to overload. When Grath moves closer to investigate the mysterious sound, the "corpse" jumps up and Crichton shoves the pistol into Grath's mouth. The pistol explodes, taking Grath's head and part of his upper body with it.