Army Private James Arness (1943)

Ken Curtis (left) as Festus Hagen and James Arness as Marshal Dillon in Gunsmoke. 

Actor James King Arness is best known for portraying Marshal Matt Dillon on
Gunsmoke (CBS-TV, 1955-1975). His brother was actor Peter Graves. Prior
to Gunsmoke, Arness appeared in two Science fiction films, The Thing from
Another World (1951), in which he portrayed the title character, and Them
(1954). Arness was a close friend of John Wayne and co-starred with him
in Big Jim McLain (1952), Hondo (1953), Island in the Sky (1953), and
The Sea Chase (1955).

 

James Arness as The Thing

James Arness as FBI agent Robert Graham in Them