Roy Jenson Roy Jenson was the Canadian - born actor who played Cloud William in the second season episode . He filmed his scenes between Monday and Friday at Desilu Stage 11 and Paramount ' s B Tank . A tall , strong - built , imposing actor , he was a veteran of the Navy during World War II , after which he began acting . He appeared primarily in Westerns early in his career , but ultimately appeared in a wide variety of genres . Jenson made several appearances on the television westerns " Gunsmoke " and " Bonanza " . He also performed stunts for both of these series . Other programs in which he has made guest appearances include " Wagon Train " , " The Andy Griffith Show " , , , , ( with Ricardo Montalban ) , and " Simon & Simon " . He was also part of the cast of the mini - series " Rich Man , Poor Man " ( 1976 , with Kim Darby , Fionnula Flanagan , Lawrence Pressman , and Leigh J . McCloskey ) , " How the West Was Won " ( 1977 , with Paul Fix , David Huddleston , Richard Kiley , and Anthony Zerbe ) , and " King " ( 1978 , with Paul Winfield and Cliff DeYoung ) . He also had a role in the acclaimed 1976 made - for - TV movie " Helter Skelter " , co - starring fellow " Trek " alumni Alan Oppenheimer , Marc Alaimo , David Clennon , Phillip Richard Allen , Bruce French , Skip Homeier , and Robert Ito . His other TV movies ( and pilots ) include " Powderkeg " ( 1971 , with Michael Ansara ) , " Kung Fu " ( 1972 , with Keye Luke and Robert Ito ) and its 1986 follow - up , " Kung Fu : The Movie " ( with Luke and William Lucking ) , " Call to Danger " ( 1973 , with Diana Muldaur , John Anderson , Michael Ansara , and William Smithers ) , and " Nightside " ( 1980 , with John de Lancie , Vincent Schiavelli , and Larry Cedar ) . He has also appeared a large number of feature films . Among his earliest was " Somebody Up There Likes Me " in 1956 . This film was directed by Robert Wise , who would go on to direct . The film also featured fellow " Star Trek " alumni Stanley Adams , Robert Easton , and Willard Sage , all of whom , like Jenson , had uncredited roles . Jenson also made an uncredited appearance in the 1959 western " Warlock " , which co - starred TOS star DeForest Kelley and guest star Whit Bissell . The film also featured TOS guest actors Paul Comi , Frank Gorshin , and Gary Lockwood in uncredited roles . Jenson also had uncredited roles in such films as " Operation Mad Ball " ( 1957 , with James Darren and Dick Crockett ) , " The Last Hurrah " ( 1958 , starring Jeffrey Hunter ) , " Al Capone " ( 1959 , with James Gregory , Nehemiah Persoff , Ron Soble , Clegg Hoyt , and TOS director Joseph Sargent ) , " North to Alaska " ( 1960 , with Stanley Adams ) , " 36 Hours " ( 1965 , with Celia Lovsky and James Doohan ) , " Morituri " ( 1965 , with George Takei and Paul Baxley ) , and " Our Man Flint " ( 1966 , with Peter Brocco ) . He had larger , credited roles in such films as " Let No Man Write My Epitaph " ( 1960 , with James Darren and Ricardo Montalban ) , " Black Spurs " ( 1965 , with DeForest Kelley ) , " Harper " ( 1966 , with Richard Carlyle ) , " Will Penny " ( 1968 , with Anthony Zerbe and William Schallert ) , " Jigsaw " ( 1968 , with James Doohan and Michael J . Pollard ) , " Number One " ( 1969 , with Diana Muldaur ) , " Paint Your Wagon " ( 1969 , with Ray Walston , Harve Presnell , William O ' Connell , and Robert Easton ) , " Big Jake " ( 1971 , with Glenn Corbett and John McLiam ) , ' s " The Getaway " ( 1972 ) , " The Life and Times of Judge Roy Bean " ( 1972 , with Anthony Zerbe and Michael Sarrazin ) , " Nightmare Honeymoon " ( 1973 , with David Huddleston and Walter Koenig ) , and " The Way We Were " ( 1973 , with Don Keefer ) . In 1973 , Jenson co - starred with Leigh Taylor - Young , Brock Peters , Whit Bissell , and Celia Lovsky in the science fiction classic " Soylent Green " . That same year , he co - starred with Joanna Cassidy and Elisha Cook , Jr . in " The Outfit " , and in 1974 , he and Vic Tayback had roles in " Thunderbolt and Lightfoot " . Also in 1974 , Jenson played what is probably his most famous movie role , Claude Mulvihill , in ' s acclaimed , Academy Award - winning film " Chinatown " . Noble Willingham and Perry Lopez also appeared in this film , which was photographed by John A . Alonzo and featured music by Jerry Goldsmith and stunts by Hal Needham . Since then , he has had supporting roles in such well - known films as " Breakout " ( 1975 , with Jill Ireland ) , " The Wind and the Lion " ( 1975 , with Brian Keith ) , " Framed " ( 1975 , with Brock Peters and Lawrence Montaigne ) , " The Car " ( 1977 , with John Rubinstein , Don Keefer , and Ronny Cox ) , " Telefon " ( 1977 , with Carl Byrd ) , " The Gauntlet " ( 1977 , with Michael Cavanaugh ) , " Every Which Way But Loose " ( 1978 , with William O ' Connell ) , " Any Which Way You Can " ( 1980 , with Michael Cavanaugh , and Logan Ramsey ) , " Tom Horn " ( 1980 , with Elisha Cook , Jr . and Bobby Bass ) , " Honkytonk Man " ( 1982 , with Jerry Hardin ) , and " Solar Crisis " ( 1990 , with Jimmie F . Skaggs and Michael Berryman ) . Jenson died of cancer in Los Angeles in April 2007 . He was 80 years old . .