His brother was Peter Graves of Airplane and Mission Impossible fame. At 6'7" he was perfect for the role of the alien in The Thing From Outers Space, a classic 50's SciFi movie (remade in the 80's with Kurt Russell into one of the best SciFi Horror movies of all time)
I remember when I saw 'Alien' for the first time, thinking "I've seen this before". It turned out to be 'It - The Terror From Beyond Space'. Was that James Arness as 'It'?
Not the same film Strovolos...the title I wrote is the film that "Alien" was updated from. edit: Ah! Just re-read your poster mate. We're at cross-purposes (or I am!)
Also on the list and about the same age if you remember him is Miriam Karlin ...... remember the Rag Trade ? ......... Everybody Out ........