Wildlife biologist and conservationist Forrest Galante dives into some of the most treacherous, shark-infested waters in the southern hemisphere all in an attempt to rediscover three unique sharks lost to science for as long as 100 years.

The Great White Serial Killer returns and it's on a killing spree that may push the California Sea Otter to extinction. Investigators deploy an otter dummy to get a closer look and witness one of the most spectacular attacks in Shark Week history.