Blackfish is a documentary that examines the dangers of keeping killer whales in captivity using archive footage and interviews. It tells the story of the killings of three people by the orca Tilikum and aims to show that orcas in captivity live shorter lives and display more aggressive behaviors compared to those in the wild. While SeaWorld disputes that keeping orcas in tanks is cruel, the documentary argues it is inhumane and has led to deaths of trainers. It presents an open-ended perspective by documenting the issue but not clearly taking a side since SeaWorld continues operations.