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.

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.

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.