William Campbell (October 30, 1923 – April 28, 2011) was an American actor who appeared in supporting roles in major film productions and also starred in several low-budget B-movies, including two cult horror films.
Campbell has obtained cult status for his guest starring roles on Star Trek, appearing first as the mischievous super-being Trelane (in part a parody of Liberace, whom Campbell resembled), 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 classic episode "The Trouble With Tribbles." He reprised the Koloth role on the series Star Trek: Deep Space Nine, some thirty years later. Campbell appeared at several Trek conventions in the 1980s and 1990s and many Star Trek fans consider Campbell's portrayal of the Trelane character as the first introduction of the "Q culture" to the series. (The Q are an omnipotent race made part of The Next Generation, then Deep Space 9 and Voyager series.) His last appearance was at the convention organized by Creation Entertainment at the Las Vegas Hilton in August 2006.
He died quietly on April 28, 2011, at the Motion Picture & Television Country House and Hospital in Woodland Hills, California.