Jeff Corey
Actor Jeff Corey , birth name Arthur Zwerling, played Plasus in the  third season episode . He filmed his scenes on Tuesday  and Wednesday , and between Friday  and Wednesday , at Desilu Stage 9, Stage 10 and Paramount Stage 5.

Born in Brooklyn, New York, Corey made over two hundred film and television appearances in a career that spanned sixty-one years. His early career included appearances in such classic films as  (1941),  (1946), and  (1947). Later feature film credits include two classic western adventures released in 1969,  and . The first features Trek guest actors Ted Cassidy, Kenneth Mars, Don Keefer, and Charles Dierkop. The latter film features one-time TOS guest actors Kim Darby, Alfred Ryder, Ron Soble, and John Fiedler. 

In 1948, Corey co-starred with TOS actors DeForest Kelley and Whit Bissell in the crime thriller , which also featured Phyllis Douglas. Corey later appeared in the 1951 film , as did veteran Trek actor Michael Ansara. Corey also played Luke Benson, the xenophobic local shot by the mole men's ray gun, in the 1951 film Superman and the Mole Men. This movie, which also featured Billy Curtis and which was the first theatrical feature-length film featuring DC Comics' Superman, was later edited into a two-part episode of the TV series Adventures of Superman.

Corey was among the many actors affected by the government's quest to seek out people they thought were communists. He was blacklisted in 1951 for refusing to name names of possible communists before the so-called . Not only did he refuse to name names, but he also critiqued the acting of previous witnesses. After being blacklisted, Corey worked as an acting teacher for twelve years, and was even one of Leonard Nimoy's early acting coaches.  Corey also worked as a drama coach for several other young aspiring actors and actresses; one of his other students being Laurel Goodwin. (Star Trek 30 Years) 

Corey returned to acting in 1963, appearing in a drama called  with Nimoy and Peter Brocco. He and Nimoy later appeared together in the 1971 film . Corey also co-starred with Salome Jens and William Wintersole in the 1966 film , which featured music by Jerry Goldsmith, and with Anthony Zerbe and Garry Walberg in , photographed by Jerry Finnerman, released in 1970. 

Other films in which Corey appeared include  (1967, with Mary Linda Rapelye),  (1970, with Alan Oppenheimer and stunts by Hal Needham),  (1970, with James Gregory and Gregory Sierra, and music by Leonard Rosenman),  (1977, with Terri Garr, Paul Sorvino, William Daniels, Clyde Kusatsu, and David Ogden Stiers) and 1980's  (with Morgan Woodward). His later career included a role in the 1984 fantasy film Conan the Destroyer (alongside young Olivia d'Abo and featuring music by Basil Poledouris), the 1986 TV movie  opposite actresses Louise Fletcher and Alice Krige, and appearances in the 1994 films  (which featured Scott Bakula, Erick Avari, and Brad Dourif) and  (with F. Murray Abraham, Bob Minor, and Trek stuntman Steve Lambert). 

His television appearances include guest spots on  ("The Night of a Thousand Eyes", with Celeste Yarnall, and "The Night of the Underground Terror", with Nehemiah Persoff and Sabrina Scharf),  ("The Bridegroom" with Joanne Linville, and "A Single Pilgrim" with John Schuck), and  ("King of the Hill" written by John D.F. Black, and "Highest Castle, Deepest Grave" with France Nuyen and Bill Quinn). In 1977, Corey, TOS star William Shatner, John de Lancie, Theodore Bikel, and Logan Ramsey appeared in the mini-series , partly directed by Leo Penn and featuring music by Gerald Fried.   

Corey also made two memorable appearances on the sitcom Night Court, appearing with John Larroquette and William Utay. In addition, Corey was the voice of the villain Silvermane in the 1990s animated  series, based on characters appearing in Marvel Comics magazines.

Corey played Justin, the middleman (or possibly "the man in between"), in the 1996 season 3 finale of Babylon 5, "Z'ha'dum" directed by Adam Nimoy. Despite only one appearance, his character was foreshadowed as Captain Sheridan's "equal and opposite", who explained to him the Shadow's philosophy and tried to convert him by reason or force.

Corey died due to injuries from a fall in Santa Monica, California on 16 August 2002, just six days after his 88th birthday. His last film was a little-known comedy called , released in 1998 and featuring Trek guest actors Andy Dick, Lee Arenberg, and Michael Shamus Wiles. His last television appearance came on 25 November 2000, in "The Jackal", an episode of  which also featured Michelle Forbes and Jack Donner. He was survived by his wife of 63 years and their three children.

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Performers
TOS performers