William Campbell William " Bill " J . Campbell , from Newark , New Jersey , was the actor known to " Star Trek " fans for his portrayal of the god - child Trelane in the first season episode and for his role as Koloth in the the second season episode . He reprised the Koloth role in the episode , becoming one of the few actors to portray the same character on both the original series and on one of the spin - off series . ( The character Koloth also appeared in a episode , but in that case , James Doohan provided the voice ) . He described his role on " Blood Oath " as his most difficult acting job , and one he would have liked to do again . ( ) Campbell also reprised his role as Trelane in the video game " " . His Klingon teeth from " Blood Oath " were once sold off by auction . Campbell filmed his scenes for " The Squire of Gothos " on Monday at Desilu Stage 9 , and between Tuesday and Monday at Stage 10 . He filmed his scenes for " The Trouble with Tribbles " on Thursday and Friday at Stage 10 . Later friend , " Original Series " Art Director Matt Jefferies , noted this on his performance as Trelane in 2002 , " " Of course , the saving grace was of course Bill Campbell that played the Squire . I think the way he took that part on , he probably wouldn ' t have missed it , if the set has disappeared . " " ( TOS Season 2 DVD - special feature , " Designing the Final Frontier " ) Campbell had always reveled in his " Star Trek " fame and had lent his presence to numerous events in the " Star Trek " convention circuit for decades . Even when his health started to fail him , starting in the early 2000s , he found the strength to attend his very last one , the Creation Entertainment 40th anniversary " Star Trek " convention held at the Las Vegas Hilton in August 2006 , still managing to keep the audience " spellbound " . Campbell was a close personal friend of Leonard McCoy actor DeForest Kelley whose death in 1999 came to him as a great personal shock . ( ) Taking center stage , Campbell spoke affectionately of his deceased friend in the " DeForest Kelley : A Tribute " - special feature on the 2004 release of , reissued on the 2009 version . Career outside " Star Trek " . Campbell worked steadily in films and on television through the 1950s and 60s , beginning with the 1950 film noir " The Breaking Point " . In this film , Campbell appeared with fellow TOS guest performers Sherry Jackson and Peter Brocco . This was followed with supporting roles in an extensive number of movies , including " Operation Pacific " ( 1951 ) , " Battle Circus " ( 1953 ) , " Escape from Fort Bravo " ( 1953 ) , " The High and the Mighty " ( 1954 , co - starring Paul Fix and William Schallert ) , " Battle Cry " ( 1955 , with Perry Lopez ) , and " Man Without a Star " ( 1955 , with George D . Wallace ) . Although Campbell received acclaim for his first starring role as a prisoner awaiting execution in the 1955 crime drama " Cell 2455 Death Row " , it did little to advance his career and returned to doing supporting roles . As one of the principal actors in 1956 ' s " Love Me Tender " , Campbell became the first actor to sing with Elvis Presley in a film . Campbell then performed in such films " Eighteen and Anxious " ( 1957 , with Yvonne Craig ) , and " The Naked and the Dead " ( 1958 , also featuring Grace Lee Whitney ) . Campbell became a regular on the Canadian TV series " Cannonball " , which lasted 39 episodes between October 1958 and July 1959 . By the 1960s , he began to appear more prominently on television , although he continued acting in low - grade films . In 1963 , he was given the lead role in Francis Ford Coppola ' s 1963 cult horror movie " Dementia 13 " , having worked with Coppola on Roger Corman ' s " The Young Racers " the year before . In 1964 , Campbell appeared in Corman ' s war drama " The Secret Invasion " and had a supporting role in the Academy Award - nominated classic " Hush . . . Hush , Sweet Charlotte " . Campbell also had an uncredited role in 1965 ' s " The Money Trap " , starring Ricardo Montalban . In 1966 , Campbell starred as a vampire artist who kills women and places their bodies within his sculptures in Roger Corman ' s " Blood Bath " , co - starring Biff Elliot and Sid Haig . Campbell ' s television credits during this time included appearances on " Philip Marlowe " ( in an episode with Barry Atwater ) , " Perry Mason " ( including an episode with Kenneth Tobey ) , " The Wild Wild West " ( in an episode with Maggie Thrett , written by Gene L . Coon ) , " Combat ! " , " Bonanza " , and " Gunsmoke " ( including one episode with James Gregory and Ed McCready , directed by Vincent McEveety ) . In addition , TOS director Herschel Daugherty cast and worked with Campbell in a 1968 episode of " It Takes a Thief ! " with Meg Wyllie and a 1969 episode of " Bracken ' s World " . In 1971 , Campbell co - starred with TOS regular James Doohan in " Pretty Maids All in a Row " , a comedy written and produced by " Trek " creator Gene Roddenberry . Dawn Roddenberry also had a small role in the film . The following year , Campbell co - starred with Bernie Casey in the blaxploitation classic " Black Gunn " , which was Campbell ' s last feature film credit , although he continued to act on television . He appeared with his TOS co - star George Takei and " Trouble with Tribbles " co - star Stanley Adams in a 1971 episode of the short - lived drama " O ' Hara , U . S . Treasury " , written by Gilbert Ralston . This was followed with appearances on " Ironside " ( with Antoinette Bower ) , " Emergency ! " ( with Vince Howard , Ken Lynch , and Kevin Tighe , directed by Joseph Pevney ) , " Adam - 12 " ( with Vic Perrin ) , " The Manhunter " ( with William Smithers ) , another episode of " Gunsmoke " , " Marcus Welby , M . D . " , " Medical Center " ( with Barbara Baldavin and Louise Sorel , directed by Joseph Pevney ) , " The Streets of San Francisco " ( with Darleen Carr , Jason Evers , and Ken Lynch ) , and " The Hardy Boys / Nancy Drew Mysteries " ( with William Schallert , and directed by Michael Pataki ) . In 1983 , Campbell appeared in a two - part episode of " Quincy , M . E . " , which featured Robert Ito and Garry Walberg as regulars , and was co - written and directed by Jeri Taylor . In 1985 , he co - starred with Barbara Babcock and Richard Kiley in an episode of " Hotel " . In 1987 , he co - starred with Gary Lockwood in the TV special " The Return of the Six Million Dollar Man and the Bionic Woman " . Campbell ' s work in the 1994 " DS9 " episode " Blood Oath " and a 1996 appearance in an episode of " Kung Fu : The Legend Continues " were his final two acting roles . A lesser known aspect of Campbell were his charity efforts , especially the fund raisings for the " " , a charitable organization that offered assistance and care to those in the motion picture industry with limited or no resources , when struck with infirmity and / or in retirement age . To this specific end he founded " FantastiCon " in 1996 , an annual science fiction and fantasy convention , which celebrated the achievements of production staffers in these genres , complete with award presentations and ceremonies . All proceeds went to the Motion Picture & Television Fund . ( " " , p . 274 : ) The fifth edition , FantastiCon V 2K , held from 14 through 16 July 2000 , was " Star Trek " themed and was well represented by " Star Trek " cast and production staffers , old and new . Several staffers were awarded on the occasion . As to underscore the fondness Campbell had for " Star Trek " , even though the convention celebrated other franchises as well , he had christened the most prestigious FantastiCon Award , the " Gene Roddenberry Award " . Unfortunately , upon the failing health of its founder , the convention has become defunct . Campbell died on 28 April 2011 at the Motion Picture & Television Country Home and Hospital of the organization he held so dear to his heart , in Woodland Hills , California , following a lengthy illness . He was 87 years old .