While we wait for more Trek we are continuing our Time Travel Retrospective Series. Join us as we talk about all of the Star Trek episodes that deal with characters moving in time. This week we continue with the TOS episode "All Our Yesterdays"! Written by: Jean Lisette Aroeste Directed by: Marvin J. Chomsky Original Airdate: March 14, 1969 When Kirk, Spock and McCoy investigate the disappearance of a doomed planet's population, they find themselves trapped in different periods of that world's past.