Blackfish is a thought-provoking documentary that examines the captivity of killer whales in marine parks, focusing on the story of Tilikum, a performing orca involved in the deaths of several trainers. The film explores the ethical implications of keeping these highly intelligent and social creatures in captivity, highlighting the psychological and physical effects it has on them. Through interviews with former trainers and experts, Blackfish raises important questions about animal welfare and the ethics of using animals for entertainment.