Attack on Titan (US) Season 1 Episode 1 – To You, 2000 Years in the Future: The Fall of Zhiganshina (1)

For the past 100 years, the remains of the human population have been living in cities surrounded by walls. The walls protect humankind from giant humanlike creatures called titans. After a century of peace behind the city walls. An unusually large Titan manages to break through the outer wall of Shiganshina District. Eren Jaegar (main protagonist), a boy from this district witnesses the brutal death of his mother by one of the titans.