The two characters from the popular television show CSI are Sara Sidle and Gil Grissom. Sara is a crime scene investigator who works with Grissom, the supervisor of the Las Vegas Crime Lab. She is a dedicated and passionate investigator who often clashes with Grissom's more methodical approach. Grissom is an experienced and respected forensic entomologist who has been with the lab since its inception. He is known for his intelligence and dedication to solving cases.