After arresting a killer, Kai displayed progressive signs of illness, albeit brushing them off and persevering but eventually Kai collapsed. After the team was unable to discover what was wrong with Kai, Janis suggested that they went to Greece to consult Theophilos, a doctor who was very accomplished in medicine during the ancient times. Theophilos brew his remedy and prompted Kai to drink the concoction. "That's good." Kai said while drinking the concoction.