From his purview in a spectacular mountain-rimmed sedge field that Treadwell calls “The Big Green,” he introduces us to his work observing upwards of 30 grizzly bears that pass by his camp on any given day.

Treadwell’s long-time companion “Timmy the Fox” and his many descendants play starring roles in this action-filled episode which encompasses two earthquakes, a wolf attack, the discovery of a past poaching operation, an arctic rain storm and ongoing harassment by Federal park rangers.

The final episode takes us deep into “The Grizzly Maze,” an extremely dense jungle habitat where one must get around using only grizzly-worn paths leading to several different creeks, feeding areas and bear hangouts.