Star Trek (1966–1969)
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All Our Yesterdays 

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.


(as Marvin Chomsky)


(created by),

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Episode complete credited cast:
Kermit Murdock ...
Ed Bakey ...
The First Fop
Scott (voice)
Anna Karen ...
Sarpeidon Mort
Albert Cavens ...
Second Fop (as Al Cavens)
Stan Barrett ...
Johnny Haymer ...
The Constable


When the planet Sarpeidon is about to be destroyed by its star Beta Niobe becoming a supernova, Kirk, Spock and McCoy beam down and find it evacuated except for its librarian, Mr. Atoz, tending with his replicas a collection of unusual discs, which play the planet's history and (to their surprise) allow their users to travel into the past trough the atavachron, a time machine, into the periods each was studying on disc, but they travel unprepared. McCoy and Spock find themselves locked in a frozen ice age 5,000 years ago, where Spock reverts to the barbaric age of the Vulcans, hence touchy and intensely attracted to the political prisoner Zarabeth, who enjoys getting company but tells them return is impossible. Kirk arrives in a Cromwellian period, where he's arrested and suspected of witchcraft, but realizes the magistrate must be a time traveler like him, and learns not being prepared at molecular level he can return through the time portal, and in fact must do so and contact Spock ... Written by KGF Vissers

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Release Date:

14 March 1969 (USA)  »

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Aspect Ratio:

1.33 : 1
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Did You Know?


The name of the librarian Mr. Atoz is a play on the phrase "A to Z". Author Jean Lisette Aroeste was a UCLA librarian at the time she wrote this script. See more »


When Spock & McCoy return to the library, Spock says Zarabeth has been dead and buried for 5000 years. If she was alone in that time period, who buried her? Her cave was near an ice cliff - presumably the leading edge of a glacier. Over 5,000 years, Zarabeth would have been buried by ice, then sediment from runoff from the receding glacier. So not "buried" in the societal sense, but archaeologically accurate. She may actually have wound up in a museum somewhere on Sarpeidon. See more »


Zarabeth: What are you called?
Mr. Spock: I'm called Spock.
Zarabeth: [smiles] Even your name is strange.
See more »

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User Reviews

An Interesting Idea Stretched Thin
25 July 2016 | by (Dallas, TX) – See all my reviews

Kirk, Spock and McCoy beam down to a planet to warn its inhabitants of an impending disaster, only to find themselves trapped in the planet's past.

"All Our Yesterdays" has echoes of "City on the Edge of Forever" but takes the concept in a completely different direction. Instead of traveling into the past and trying to figure out how not to alter it and never mind how they get back, here they have to figure out how to get back and never mind how much they alter it. The point is, it's a twist on one of the most popular episodes of the series, so the elements are there for a great episode.

Unfortunately, those elements never really come together. Kirk finds himself imprisoned in a Renaissance period and must find a way to escape; Spock and McCoy are trapped in an arctic wilderness and must find shelter. Neither story is particularly compelling, barely filling its time on screen. We also have a frame story set in a "library" where the time travel is managed. That part never feels like anything more than filler. It doesn't help that there's such a short time frame in which the story plays out. This is something that would have worked better over days, not hours.

The best part of the episode is Spock's narrative, as he finds himself losing control of his emotions and falling in love with a woman trapped in the past with him. But that part of the episode doesn't quite make sense. We're told that the effects of time travel will be deadly, but Spock is the only one who shows any adverse effects at all -- and McCoy's explanation of the effects he suffers are nothing like what are described by others. (Speaking of McCoy, his accusations against Zarabeth seem unfounded, as far as anyone actually knows.) And the crew has traveled into the past before; why is it so deadly this time? And why doesn't Spock's phaser work?

Ultimately what we are left with is a feeling of incompleteness. The away team members travel into the past, spend some time in an enclosed area talking to the locals, then return to their own time...and some scenes in a "library" fill out the time. For all that's at stake, nothing seems very urgent or grand. "All Our Yesterdays" is probably one of the better third-season episodes, but overall it's middle-of- the-road at best.

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