Sundance film "Blackfish" is stealing the show, says CNN. Blackfish exposes SeaWorld's dark past and explores the story behind Tilikum, SeaWorld's killer orca whale. Blackfish was number one in cable news and highest-rated on CNN Films. "Blackfish " shows how Tilikum was stolen from his mother by whale hunters. Several orcas were killed. He was sold to a now-defunct marine amusement park. In 1991, Tilikum killed a trainer. Later, a man snuck in to the pool at night and was found dead on Tilikum's back. That park finally closed and Tilikum was bought by SeaWorld says Higher Grounds for Animals. SeaWorld said he'd only be used for breeding. "Blackfish" SeaWorld Killer Orca Whale Tilikum Steals Show