Campbell's film career began in 1950, with a small part in the
John Garfield film
The Breaking Point. After several years of similar supporting performances in a number of films, including as a co-pilot in
William Wellman's
The High and the Mighty (1954), he won his first starring role in
Cell 2455 Death Row (1955), a low-budget prison film for
Columbia Pictures. He played a
death row inmate, based loosely on the true story of
Caryl Chessman, who staunchly proclaimed his innocence and obtained numerous reprieves over many years until finally being executed. Campbell's surprisingly powerful performance received generally good notices from critics, but it did very little for his career; his next several roles were again providing support to lead actors, including
Man Without a Star (1955),
Love Me Tender (1956) in which he became the first person to lip sync portions of a song onscreen (actually recorded on August 24, 1956, by the Ken Darby Trio) with
Elvis Presley, and
the 1958 film version of
Norman Mailer's
The Naked and the Dead. In 1958, Campbell co-starred with
Paul Birch in
Cannonball, a short-lived
television series about truck drivers. After that, he worked for more years in small parts in increasingly lower grade movies. Campbell made two guest appearances on
Perry Mason in 1959 and 1960. In his first appearance he played the title character and murder victim Allen Sheridan in "The Case of the Artful Dodger," then he played murderer and title character Jim Ferris in "The Case of the Ill-Fated Faker." In 1963, Campbell began a brief association with
Roger Corman, starring in the director's
The Young Racers that year. The auto-racing-themed movie, written for the screen by Campbell's brother
Robert Wright Campbell, was shot in Ireland. After production was completed, the film's sound man,
Francis Ford Coppola, talked Corman into allowing Coppola to remain in Ireland with a small crew and direct a low-budget horror film, to be produced by Corman. Coppola promised it would be the cheapest film Corman was ever involved in. Shot for approximately $40,000, the resultant film,
Dementia 13 (1963), was an atmospheric and violent horror thriller clearly made in imitation of
Psycho. Campbell starred as a moody loner who at one point becomes the chief suspect in a series of gruesome axe killings;
Patrick Magee and
Luana Anders led the supporting cast. Many years later, Campbell would provide an
audio commentary for the film's
DVD release. Campbell also starred in another Corman-produced horror yarn. Filmed in 1963 in
Yugoslavia under the title
Operacija Ticijan, again with Magee in the cast, the film was never released in its original form. It was re-edited, re-dubbed, and briefly shown on television as
Portrait in Terror. Years later, additional footage was shot in California, first by
Jack Hill, then by
Stephanie Rothman, transforming what was once a spy thriller into the story of a
vampire stalking the streets of
Venice, California. Retitled
Blood Bath, although it also became known as
Track of the Vampire, the film received a limited theatrical release in 1966. Campbell also filmed
The Secret Invasion in Yugoslavia, directed by Roger Corman and written by his brother Robert Wright Campbell. Campbell was the only one of the team of commandos not given screen credit above the title. One year previously in 1965 he landed a supporting role as a reporter in the classic suspense horror;
Hush...Hush, Sweet Charlotte. In
Blood Bath Campbell's character was an artist who killed women and hid their bodies inside his sculptures; he is also a vampire who can freely walk during the daylight in search of victims. However, the fanged vampire was confusingly played by another actor who did not resemble Campbell. Like
Dementia 13, the film has managed to develop a following despite its deficiencies. In the early 1990s,
Video Watchdog magazine devoted lengthy articles in three separate issues painstakingly detailing the convoluted production history of this strange but fascinating movie. Campbell had guest-starring roles in the
Star Trek franchise, appearing first as the mischievous super-being
Trelane in an episode of
the original series called "
The Squire of Gothos". Campbell also appeared twice as the
Klingon Captain
Koloth. Campbell first played Koloth on the original
Star Trek series in the episode "
The Trouble with Tribbles". He reprised the role on the series
Star Trek: Deep Space Nine episode entitled "
Blood Oath", some thirty years later. Campbell appeared at several Trek conventions in the 1980s and 1990s. His last appearance was at the convention organized by
Creation Entertainment at the
Las Vegas Hilton in August 2006. ==Personal life and death==