When Lassie keeps coming home with greasy muck on her legs, Timmy and Boomer investigate, and discover a pool of oil on their property. But Uncle Petrie's investigation of the pool proves to be his undoing.
When Lassie keeps coming home with greasy muck on her legs, Timmy and Boomer investigate, and discover a pool of oil on their property. But Uncle Petrie's investigation of the pool proves to be his undoing.
