This landmark sci-fi movie is performed beautifully by an excellent cast led by Michael Rennie as a kindly alien and Patricia Neal as the boss of the boarding house where he shelters. There's much else to savour in this classic, from Bernard Herrmann's haunting score to the imposing presence of Rennie's giant silver robot companion Gort. `Klaatu barada nikto! ' was a cult catchphrase of the day.