Tige Andrews Tige Andrews was the actor who played the Klingon Kras in the episode of . He filmed his scenes between Wednesday and Monday on location at Vasquez Rocks and at Desilu Stage 10 . Andrews has about a dozen movie roles and fifty television guest appearances to his credit , but he is probably best known for his Emmy Award - and Golden Globe - nominated regular role as police captain Adam Greer on , co - starring future guest actor Clarence Williams III . He was born in Brooklyn as Tiger Andrews from Syrian immigrant parents ( his father ' s original family name was Androwas ) . Following Syrian custom , his parents named him after a strong animal to ensure his good health . A graduate of the American of Dramatic Arts in New York , Andrews began his acting career in theater , working both on and off Broadway . His television career started with appearances on various anthology shows in the early 1950s , ultimately becoming a regular on " The Phil Silvers Show " – the cult sitcom also known as " Sgt . Bilko " – after which he took on a recurring role on " The Detectives Starring Robert Taylor " from 1959 through 1962 . In 1955 , Andrews made his feature film debut when director John Ford cast him in " Mister Roberts " , having seen Andrews in the Broadway play on which the film was based . Fellow " TOS " guest actor Perry Lopez also had a role in this film . John Ford subsequently cast Andrews in an uncredited role in the 1957 drama " The Wings of Eagles " , starring John Wayne and also featuring Kenneth Tobey . That same year , Andrews appeared in the war drama " Until They Sail " , directed by Robert Wise and starring Jean Simmons . Subsequent film credits include supporting roles in 1958 ' s " Onionhead " ( co - starring James Gregory ) , 1968 ' s " In Enemy Country " ( with Gene Dynarski ) , and Elia Kazan ' s 1976 classic " The Last Tycoon " ( also featuring Seymour Cassel , Jeff Corey , and Byron Morrow ) . The majority of Andrews ' television work took place throughout the 1960s . During this time , Andrews worked with fellow " Star Trek " alumni Jeanne Bal ( in an episode of " Mr . Novak " , also with Vince Howard ) , Whit Bissell ( on " Jericho " ) , Roger C . Carmel ( on " Premiere " , along with Fritz Weaver ) , Paul Comi ( on " Twelve O ' Clock High " , starring Robert Lansing ) , Paul Fix ( in an episode of " The Best of the Post " ) , Sam Gilman ( on " Sam Benedict " ) , Steve Ihnat ( in an episode of " The Fugitive " ) , Janet MacLachlan ( on " Run for Your Life " ) , Dallas Mitchell ( on " The F . B . I . " ) , Susan Oliver ( on " The Dick Powell Show " ) , Percy Rodriguez ( on " Slattery ' s People " and " Bob Hope Presents " ) , and Warren Stevens ( also on " Slattery ' s People " ) . He also made guest appearances on hit programs like " Dr . Kildare " , " Ben Casey " , and " Gunsmoke " and had a recurring role on " Gomer Pyle , USMC " , during which he worked with Michael Barrier and Ken Lynch . Additionally , he earned an Emmy nomination for his 1967 guest appearance on " The Big Valley " , in an episode with Paul Sorenson . After portraying Captain Greer on " The Mod Squad " from 1968 through 1971 , Andrews went on to appear in a " Police Story " two - parter with Anthony Caruso and Phillip Pine . In 1975 Andrews again co - starred with " Trek " star William Shatner on the latter ' s short - lived series " Barbary Coast " , in an episode with Louise Sorel . Also in 1975 Andrews guest - starred in an episode of " Police Woman " with David Huddleston and Bert Remsen . In addition , he made several appearances on " Kojak " ( working with Whit Bissell , Antoinette Bower , Seamon Glass , Robert Ito , Stephen Macht , and Andrew Robinson ) and " CHiPs " ( with Michael Dorn , Paul Comi , Robert Pine , and Paul Sorenson ) before concluding the 1970s by reprising his role on Greer in the TV special " Return of the Mod Squad " . Andrews continued working in television throughout the 1980s , appearing on shows such as " Vega $ " ( in an episode with Rod Loomis and Phil Morris ) , " CHiPs " ( with the aforementioned Michael Dorn and Robert Pine along with William Lucking ) , and " Quncy , M . E . " ( starring Robert Ito and Garry Walberg ) . Andrews ultimately retired in 1990 after guest - starring in an episode of " Murder , She Wrote " with Robert Costanzo , Monte Markham , William Utay and William Windom . Andrews passed away in Encino , California , at the age of 86 , leaving behind six children , 11 grandchildren , and a career spanning more than 60 years . Other " Trek " connections . Additional projects in which Andrews worked with other " Star Trek " alumni include :