tomorrow be yesterday be the second episode that deal with a time travel premise . in this episode and a space anomaly send the enterprise to the 20th century earth and and kirk and his crew try to go back to the future without alter the past . of course and all sort of complication arise . not as good a the late city on the edge of forever and but well make and interesting . it be actually very similar to the feature length movie the voyage home ( 1986 ) . like most show that deal with time travel and the story do not make much sense and but this show be an excellent example of how far the series have come in a relatively short time . very enjoyable .