When the Enterprise is assigned to observe Earth's history in 1968, suddenly it intercepts a transporter beam which originates at least a thousand light-years from Earth, bringing aboard a humanoid alien 'agent Gary Seven' holding a black cat called Isis, who warns them to step back and let him go to accomplish his mission to save Earth; initially phaser-struck down, he manages to beam himself away, actually on a mission to prevent a nuclear rocket being launched at McKinley base because earth is socio-politically not ready for its technological progress. He assumes a classified identity to override a powerful computer, and mistakes the wrong girl, Miss Lincoln, for another agent; the computer reports both other agents he seeks are deceased in an accident. Meanwhile Kirk and Spock beam down to investigate if the alien isn't hostile, realizing the risk of changing their own past. When they get on his trail, the girl sees Spock's ears, calls the police and Seven gets away; they must ... Written by
Did You Know?
The name "Roberta Lincoln" is a feminine version of Robert Lincoln
. Robert Todd Lincoln was a lawyer, politician, and businessman who had a long career and was present at or near the violent deaths of three USA Presidents: Abraham Lincoln
(his father), James A. Garfield
, and William McKinley
. It is unknown if the writers intended any such allusion, as Roberta has very little in common with Robert Todd Lincoln. Possibly the idea is that in the unproduced series she would "just happen" to be near a lot of historical events including assassinations. See more
The black markings on the rocket change from shot to shot, because some views are of the prototype facilities checkout vehicle rather than an actual rocket. On the prototype the black stripes on the first stage are longer and are linked at the top by a black ring. Additionally, the prototype third stage has four black panels at the top and a ring at the bottom: the version seen lifting off has only a black ring at the top. See more
Captain James T. Kirk
Captain's log. Using the light speed breakaway factor, the Enterprise has moved back through time to the 20th century. We are now in extended orbit around Earth, using our ship's deflector shields to remain unobserved. Our mission - historical research. We are monitoring Earth communications to find out how our planet survived desperate problems in the year... 1968.