5. Blackfish (2013)

This documentary tells the story of Tilikum, an orca who was torn away from his family and the ocean life at age 2. With shocking footage, expert interviews, and touching testimonials, director Gabriela Cowperthwaite pieces together the life of the performing whale who killed several people while in captivity. Blackfish challenges viewers to consider our relationship with nature and ask ourselves how much we really know about life under the oceans.