Best Friend Forgotten is a 2004 American documentary film that sheds light on the difficult issue of pet overpopulation. The documentary, hosted by David Duchovny (Californication, X-files), tells the stories of Oreo the cat and Clover the dog as they face the harsh realities of pet overpopulation. Viewers get a thoughtful and balanced look at the controversial practice of euthanasia and the alternative no-kill movement.