As Marty and his crew continue to delve into the life cycle of the Cutthroat Trout, their exploration leads to Grizzly Creek. Here, Marty finds evidence of the big Bears' presence and goes underwater to film the spawning ritual of the Cutthroat. In a fitting finale, some Trout die, as others return to the Lake. As the adventure ends, we're left with deeper feeling for all life.