Who Do You Think You Are? USA

NCIS: Los Angeles star Chris O'Donnell travels to Missouri to discover his ancestor’s involvement in aiding victims of the catastrophic 1849 cholera outbreak. During his visit he learns how his forebear contributed to relief efforts for those affected by the epidemic.

The programme is an episode that follows Chris O'Donnell, the actor best known for his work on NCIS: Los Angeles. It presents a short documentary‑style segment centred on O'Donnell himself, rather than a fictional storyline, and it fits within the broader format of a television episode. In the episode, O'Donnell travels to the state of Missouri where he discovers that one of his forebears played a part in assisting people affected by the severe cholera outbreak of 1849. The visit gives him a chance to learn how his ancestor contributed to relief efforts during that devastating epidemic, linking his family history to a significant public‑health crisis. The feature concentrates on this personal connection, using the historical episode of the 1849 cholera epidemic as the backdrop for O'Donnell’s exploration. By tracing his lineage back to those who helped the afflicted, the programme offers a glimpse into how a single family's actions intersected with a major event in Missouri’s past.