In a two-hour “Monster Week” special, veteran wildlife conservationist Bradley Trevor Greive leads an elite team into uncharted Alaskan wilderness in search of Grandfather – a bear locals believe is the largest to ever roam the earth. To prove the massive predator’s existence, the team will rely on ancient indigenous tracking techniques to obtain DNA and video evidence of the beast. But as they track it deeper into its deadly domain – an island with the densest concentration of bears on the planet – they realize that their greatest challenge will be surviving the expedition.