In the climax of the film, Dr. Robert Neville (played by Will Smith), the last known survivor in New York City after a virus outbreak, sacrifices himself to save Anna (played by Alice Braga) and Ethan (played by Charlie Tahan) from a horde of infected mutants known as “Darkseekers.”
Throughout the movie, Neville conducts experiments in an attempt to find a cure for the virus that has devastated humanity and turned most people into aggressive, zombie-like creatures. He also searches for other survivors and broadcasts a radio message in the hopes of finding them.
In the final moments of the film, Neville realizes that his blood contains the cure for the virus. He decides to use himself as a test subject and injects himself with a vial of the cure, knowing that he will likely die in the process.
As Neville and Anna prepare to flee the city with Ethan, they are ambushed by a group of Darkseekers. In a desperate last stand, Neville detonates a grenade, killing himself and several Darkseekers while allowing Anna and Ethan to escape to a survivor colony in Vermont.
The film ends with Anna and Ethan arriving at the colony, where they are welcomed by other survivors. Anna shares Neville’s sacrifice with the group, ensuring that his legacy lives on and that his efforts to find a cure for the virus are not forgotten.
Overall, the ending of “I Am Legend” is a bittersweet conclusion to the story, as Neville makes the ultimate sacrifice to save humanity and ensure the survival of the cure he discovered. Through its blend of action, suspense, and emotional depth, the film offers audiences a thrilling and thought-provoking exploration of survival, sacrifice, and the resilience of the human spirit in the face of adversity.