Extras
Invasion of the Killer Whales | Preview
Airs Wednesday, November 19, 2014 at 8:00 p.m. ET/PT. Check your local listings.
Invasion of the Killer Whales | Preview
Killer Whales Attack Pod of Narwhal
Killer whales pin down an entire pod of narwhal in shallow water.
Killer Whales Attack Pod of Narwhal
Polar Bears Try to Catch Salmon
Polar bears are forced to try their luck hunting salmon as arctic ice sheets dissappear.