the name of an episode

[hanit486]

hi,
i need the name of the episode when kirk and spock go back in time to earth, and meet this woman kirk falls in love with, and finds out she must die to keep time on its track.
please help!!

[Al Katerinsky]

If no one has given it to you by now, the episode's title is "THE CITY ON THE EDGE OF FOREVER" Production Number 28, if that helps.