Blackfish is a thought-provoking documentary that examines the captivity of killer whales in marine parks, focusing on the story of Tilikum, a captive 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 physical and psychological consequences they face. Through interviews with former trainers and experts, Blackfish raises important questions about animal welfare and the ethics of using marine mammals for entertainment purposes.