Lassie

Walden (15x22)

Air date: Mar 02, 1969

Lassie befriend Patricia Prescott, who refers to herself as "Walden," a free-spirited teenage girl, who has left home to live in the wilderness like her idol, Henry David Thoreau, after the young woman cleans up a picnic area. But both of them are endangered by aftershocks from an offshore earthquake.