In Season 2, Harvey is discovered. He is basically a menacing hallucination of Scorpius that influences Crichton to become more erratic, unpredictable and similar to Scorpius. He is capable of killing Crichton and does his best to make sure that Crichton would not go against Scorpius's ideas. In the end of Season 2, Harvey dominates Crichton (resulting in a mixed personality with dark humor), murders his love Aeryn Sun (whom the mixed personality also is attracted to) and transmits a message to Scorpius. After that, Crichton regains control, the chip is removed and stolen by Scorpius.