Roger C . Carmel Roger C . Carmel was a rotund character actor and sometime comedian whose trademark was a handlebar mustache . He is most famous for playing the role of Harcourt Fenton " Harry " Mudd on in the episodes and . With the exception of those actors who played crew members on the series , Carmel is the only actor to play the same character in more than one episode of TOS . He also voiced the character in an episode of , . Carmel filmed his scenes for " Mudd ' s Women " between Friday and Monday at Desilu Stage 9 and Stage 10 . He filmed his scenes for " I , Mudd " between Monday and Friday at Stage 10 . Early career ( 1958 - 1960s ) . Born in Brooklyn , New York , Carmel broke into film in 1958 . That year , he made an uncredited appearance in the film . Starring in that film were fellow " Star Trek " alumni Christopher Plummer and John Fiedler . Carmel went on to have larger roles in the films ( 1964 , with Stanley Adams ) , ( 1966 , with James Gregory , Grant Woods , and Nancy Kovack ) , and ( 1966 , with John Abbott , Arnold Moss , Vic Tayback and an uncredited Tanya Lemani ) . He began working in television in the early 1960s , appearing on programs such as " Naked City " , " Car 54 , Where Are You ? " , " The Dick Van Dyke Show " , " The Munsters " , " The Man from U . N . C . L . E . " , and " I Spy " . In addition to playing Harry Mudd , he is also well - remembered by fans of the 1960s television series as Colonel Gumm , a stamp obsessed , identity swapping villain who very nearly gummed , perforated , and coiled Batman and Robin . Carmel was a regular on the NBC sitcom during the 1967 - 68 TV season , where he played the role of Roger Buell . After the show ' s first season , NBC opted to renew the series for a second season , but due to less - than - spectacular ratings , the network was unwilling to pay any increases in budget or salary . The entire cast and crew of the show agreed to forgo salary increases to keep the show on the air , with the exception of Carmel , who threatened to quit unless he was given a second season raise . The producers were left with no choice but to fire Carmel and replace him . Afterward , Carmel found it difficult to procure a regular role on an ongoing television series . Later career ( 1970s - 1986 ) . In 1971 , Carmel appeared in an episode of " Ironside " with TOS castmate William Shatner . Carmel ' s television work during the 1970s also included appearances on " The High Chaparral " ( with Henry Darrow and Malachi Throne ) , " Hawaii Five - O " ( including a two - parter with Sabrina Scharf and directed by Michael O ' Herlihy ) , " Banacek " ( in an episode written by Stephen Kandel that co - starred Logan Ramsey and David Spielberg and was directed by Lou Antonio ) , " Chico and the Man " , " All in the Family " , and " Three ' s Company " . His film credits during this period included the 1970 adventure film " Skullduggery " ( with William Marshall and Booker Bradshaw ) , ' s 1973 romantic drama " Breezy " , and the 1977 adventure film " Thunder and Lightning " . The latter picture was directed by Corey Allen and also starred George Murdock and Charles Napier . In 1980 , Carmel co - starred with Susan Oliver in the Jerry Lewis comedy film . The following year , Carmel won the regular role of Lawrence Brody in the NBC series " Fitz and Bones " , on which he co - starred with actress ( and fellow two - time TOS guest star ) Diana Muldaur . The series only lasted five episodes , but Carmel and Muldaur would reprise their characters in a 1982 " Fitz and Bones " TV special entitled " Terror at Alcatraz " . After the failure of " Fitz and Bones " , Carmel performed primarily as a voice actor , most notably for the animated series , on which Michael Bell also worked . He and Bell went on to voice for the feature - length , along with TOS star Leonard Nimoy . His voice work also included " My Little Pony and Friends " and Disney ' s " Adventures of the Gummi Bears " and " DuckTales " . Carmel was also the voice of Smokey the Bear in countless Forest Service public service commercials throughout the 70s and 80s . In addition , he found success in commercials for the Mexican fast food restaurant chain , Naugles , for which he played Señor Naugles , a kindly , old Mexican general . Death . Carmel continued to work steadily doing both voice - over work and the Naugles commercials until 1986 , when , on 11 November , he died of a massive heart attack due to complications from atherosclerosis and an enlarged heart muscle , a legacy of chronic alcoholism and drug abuse . He was 54 years old . There have been varying reports as to Carmel ' s cause of death . The statement originally released to the public at the time of his death stated that he had committed suicide by overdosing on aspirin . Another story has been relayed by a male prostitute who claimed to have frequented Carmel ' s home . According to this story , Carmel died of an accidental crack cocaine overdose while celebrating his new - found good fortune . These claims , however , were not confirmed . The official cause of death is hypertensive cardiomyopathy ( heart disease ) .