The finale resolves the central mystery of Marc’s death on December 31, 2023, while exploring how the characters' interventions have fundamentally altered their personal lives—specifically Juliette's relationship with her husband and Cédric's future with Margot. Major Themes and Production

The "Final" episode brings the trio's year-long journey full circle:

The season finale of the French science-fiction thriller (Season 1, Episode 4) serves as the climactic resolution to a high-stakes time-travel mystery. The episode follows Anna, Juliette, and Cédric as they finally identify the killer of cardiac surgeon Marc Honoré and attempt to rewrite a history that has repeatedly proven resistant to change. Plot Resolution and The Killer's Identity

By the finale, characters like Anna are forced to choose between their past desires and the necessity of preventing a murder, often finding themselves "more alone than ever" as they near the final deadline.

For further details on the series and its cast, you can visit the Année zéro page on AlloCiné or review the episode guide on IMDb .