Lyndon B. Johnson

Lyndon Baines Johnson (August 27, 1908 - January 23, 1973) was an American politician who lived during the 20th century. He served as the 36th President of the United States from the assassination of his predecessor John F. Kennedy on November 22, 1963 until January 20, 1969. He had previously served as a Senator from Texas from 1949 to 1961 and as U.S. Vice President from 1961 to 1963.

When the Talosians scanned the USS Enterprise (NCC-1701)'s database in 2254, two photographs depicting Johnson appeared on the ship's viewscreen as they downloaded the library computer files. The first depicted him as Vice President during President Kennedy's "Decision to Go to the Moon" on May 25, 1961 while the second depicted him being sworn in as President following Kennedy's assassination. 

On April 4, 1968, Cromwell - the launch director of McKinley Rocket Base - asked for a direct telephone line to President Johnson in order to inform him that a nuclear missile from the base had malfunctioned. This could have led to World War III but the missile was destroyed by Gary Seven, who had sabotaged it in the first place.