A pergunta é um pouco concisa, mas isso imediatamente me fez pensar no final teatral de Eu Sou a Lenda (2007). (note que há um final alternativo que é mais fiel ao livro)
De IMDb :
Robert Neville is a scientist who was unable to stop the spread of the terrible virus that was incurable and man-made. Immune, Neville is now the last human survivor in what is left of New York City and perhaps the world. For three years, Neville has faithfully sent out daily radio messages, desperate to find any other survivors who might be out there. But he is not alone. Mutant victims of the plague -- The Infected -- lurk in the shadows... watching Neville's every move... waiting for him to make a fatal mistake. Perhaps mankind's last, best hope, Neville is driven by only one remaining mission: to find a way to reverse the effects of the virus using his own immune blood. But he knows he is outnumbered... and quickly running out of time.
O final abaixo tem Anna, uma sobrevivente do sexo feminino, e seu filho Ethan trazendo um frasco de "cura" para uma fortaleza, depois
Neville successfully developed said cure, but died protecting them from the creatures.
