This four-disc set features a series of incredible National Geographic documentaries. "Killer Whales: Wolves at Sea" (1993) offers an enthralling study of the large cetaceans and their quest for survival, hunting in packs like wolves as they search for their next meal. They may be friendly and clever tricksters in captivity, but follow dolphins in the wild and another side is revealed: that of fast and cunning predators. "Dolphins: The Wild Side" (1999) explores this rarely seen side of the beloved sea creature. Watch in amazement as a "Crittercam" is attached to a ferocious tiger shark, in "Tiger Shark: Predator Revealed" (2000)...you can't get any closer and still be safe! Biologist William Gilly examines the large, ravenous Humboldt squid known as the "red devils" and found in the Gulf of California in Mexico, in "Devils of the Deep: Jumbo Squid" (2003). 3 2/3 hrs. total. Standard; Soundtrack: English Dolby Digital stereo.