On a trek through the Oregon rainforest, Lassie and her master discover a careless camper who has leaked oil into a stream, endangering hundreds of ducks on their seasonal flight. The Ranger and Lassie teach the camper a conservation lesson he won't soon forget.

On a trek through the Oregon rainforest, Lassie and her master discover a careless camper who has leaked oil into a stream, endangering hundreds of ducks on their seasonal flight. The Ranger and Lassie teach the camper a conservation lesson he won't soon forget.