When their livestock suddenly start dying, angry ranchers blame a mountain lion and her newborn cubs instead of a wild dog. Working to protect mama cougar, Lassie plays peacemaker amid a climate of fear. Everyone's favorite female collie also helps a stallion regain its trust in humans. From the late 1960s three-part television series, this feature-length film stars John Provost, Hugh Reilly, and Robert Bray, who portrays ranger Corey Stuart.