Richard Carlyle Richard Carlyle is the actor who played geologist Carl Jaeger in the episode . He was born in St . Catharines , Ontario , Canada . His death was reported by guest star Jim Beaver on 24 November 2009 . Carlyle filmed his scenes on Friday , Monday , Tuesday , Wednesday and Thursday at Desilu Stage 9 and Stage 10 . Carlyle was a long - time member of the Los Angeles theater company Theatre West , of which Jim Beaver is currently a member . Carlyle ran the apprentice program at Theater West for many years ; one of his students was actress ( and Jim Beaver ' s wife ) , Cecily Adams . Other " Star Trek " veterans who are ( or were ) part of the Theatre West company include Barry Jenner , Hal Lynch , Lee Meriwether , and Malachi Throne . Career . Television . Carlyle acted in many live television dramas during the 1950s , including " Studio One " , " Kraft Television Theatre " , and " Playhouse 90 " . In his first episode of " Studio One " in 1950 , entitled " The Last Cruise , " he co - starred with DeForest Kelley nearly seventeen years before they worked together on " Star Trek " . This episode also featured Richard Webb , who later guest - starred in the " Star Trek " episode . Carlyle later worked with Leonard Nimoy prior to their time on " Star Trek " when they guest - starred together in two episodes of the western series " 26 Men " in 1959 . In addition , Carlyle acted alongside Richard Kiley on the live NBC anthology series " The Clock " in 1951 . On " Playhouse 90 " in 1958 , Carlyle worked with fellow " Star Trek " guest performers Tige Andrews and Celia Lovsky , as well as guest star Paul Lambert . Carlyle made recurring appearances on various shows during the late 1950s and early 1960s , though never as the same character . He made three appearances on the crime drama " 77 Sunset Strip " between 1958 and 1962 . He also guest - starred in two episodes of the western series " Wanted : Dead or Alive " , the first in 1959 ( with Phillip Pine ) and the second in 1961 ( with Bill Quinn ) . In addition , he made two separate appearances on the crime drama " The Untouchables " , first in 1959 ( in an episode with Lawrence Dobkin and Dick Miller ) and again in 1961 ( in a two - part episode with William Schallert ) . Besides " Star Trek " , the other television shows on which Carlyle appeared throughout the 1960s include " Dan Raven " ( a crime drama which starred Skip Homeier in the title role ) , " One Step Beyond " ( directed by John Newland and acting with Richard Hale ) , " Alfred Hitchcock Presents " ( with John Anderson ) , " Alcoa Premiere " ( directed by Herschel Daugherty ) , " The Alfred Hitchcock Hour " ( with William Sargent ) , " Dr . Kildare " ( with Tony Dow ) , " The Great Adventure " ( with Andrew Prine ) , " A Man Called Shenandoah " ( with Harry Townes and Bill Zuckert ) , " Land of the Giants " ( with Don Marshall ) , and " Marcus Welby , M . D . " ( with Byron Morrow ) . He also appeared on the popular westerns " Rawhide " and " Gunsmoke " . In the 1970s , Carlyle appeared on the television series " Cannon " ( with Lou Antonio ) , " Harry O " ( starring Anthony Zerbe ) , " Kojak " ( with Andrew Robinson ) , " Emergency ! " ( with Kevin Tighe ) , and " The Brady Bunch " . He also had small roles in a few TV movies , including " Say Goodbye , Maggie Cole " ( directed by Jud Taylor ) and " Marciano " ( with Richard Herd and Michael Pataki ) . He only appeared in two television shows during the 1980s : " Brothers " ( in an episode with Hallie Todd ) and " This Is the Life " ( with Kim Darby , Henry Darrow , and the aforementioned Andrew Robinson ) . His last television work was the 1994 TV movie " Secret Sins of the Father " , which also featured Jack Kehler , Ed Lauter , Bert Remsen , and Mark L . Taylor . Film and stage work . Carlyle also has many feature film and stage productions to his credit . He has performed in several Broadway plays , including " Mrs . Gibbons ' Boys " in 1949 ( with Ray Walston ) , " Out West of Eighth " in 1951 ( with Mary Carver ) , and " Fragile Fox " in 1954 ( with James Gregory and Jason Wingreen ) . His first film was the 1951 war drama " Target Unknown " . Carlyle ' s second film role was that of Rezin , the brother of Jim Bowie in the 1952 western " The Iron Mistress " . In 1958 , he was directed by Joseph Pevney in the war drama " Torpedo Run " , which also featured Frank Gorshin , Don Keefer , and William Schallert . Carlyle ' s next film , 1960 ' s " The Gallant Hours " , was also a war film with William Schallert . Ward Costello had a major supporting role in this latter production . Carlyle had a supporting role in the 1966 detective film " Harper " , along with Roy Jenson . The following year , Carlyle was seen in the yacht racing drama " Sail to Glory " with James B . Sikking . His next and last feature film came over two decades later when he made a brief appearance in the 1990 submarine comedy " Going Under " . guest actress Wendy Schaal and TNG guest star Chris Demetral were two of the stars of this film .