Immortality (CSI: Crime Scene Investigation)

Immortality, in the context of CSI: Crime Scene Investigation, refers to the two-hour television movie that served as the series finale, concluding the original run of the long-running CBS procedural drama. Released on September 27, 2015, "Immortality" brought back original cast members William Petersen (Gil Grissom) and Marg Helgenberger (Catherine Willows) alongside the established cast of the fifteenth season.

The episode centers around a bombing at a casino owned by Catherine Willows and the subsequent investigation that draws Grissom back to Las Vegas. The narrative explores themes of legacy, the passage of time, and the enduring impact of the cases and relationships formed during the show's fifteen seasons.

"Immortality" aimed to provide closure for the characters and the audience, revisiting past storylines and offering a sense of finality to the CSI narrative. It showcased how the characters had evolved over time and emphasized the lasting bonds between them. The episode also highlighted the changing landscape of forensic science and crime investigation.

The title, "Immortality," alludes to the enduring nature of the work performed by the CSI team, suggesting that their dedication to justice and the pursuit of truth leaves a lasting impact, even after their individual roles change or end. It also implies the enduring nature of the CSI franchise itself, with the continued legacy influencing subsequent crime procedurals.