Captain Picard and his archaeological curiosity are called upon by scientists from Earth when they find evidence to support beliefs that aliens had visited Earth in the late 1800s.



(created by), (teleplay) | 2 more credits »

Watch Now

$0.00 with Prime Video



1 video »


Episode cast overview, first billed only:
Michael Aron ...
Barry Kivel ...
Ken Thorley ...
Jack Murdock ...


Picard and the Enterprise are urgently called back to Earth to see the results of an archaeological dig that reveals aliens may have visited the planet in the 19th century. Among the many relics they have found is one that is totally out of place - Commander Data's head. Data confirms that it is his own head and not that of his brother Lore. He seems completely at ease with the find, which is not the case with the rest of the crew. On the planet, Data encounters a temporal vortex and he suddenly finds himself transported to 19th century San Francisco where he meets none other than Guinan. Written by garykmcd

Plot Summary | Add Synopsis




Release Date:

13 June 1992 (USA)  »

Company Credits

Production Co:

Show detailed on  »

Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
See  »

Did You Know?


The title is in reference to British astrophysicist Arthur Stanley Eddington's 1927 concept that time is run as a "one-way direction" or "asymmetry" and that its direction can be determined by studying the organization of atoms, molecules, and bodies. See more »


When Geordi and Data are in ten forward, Data tells Geordi he is rather comforting knowing that he's going to die someday. The feeling of comfort is an emotion, and does not belong to Data. See more »


Beggar: [to Data, believing him to be a fellow beggar, gives him some tips on how to hit people up for money] Stockbrokers are as cheap as hell - don't even ask 'em. Best handout is a young man with his lady. You give him a chance to impress her by bein' generous. But stay clear of the sailors - likely as not, you'll get a fist across the jaw for your trouble.
See more »


Referenced in Star Trek: The Next Generation: Timescape (1993) See more »


Star Trek: The Next Generation End Credits
Composed by Jerry Goldsmith and Alexander Courage
See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

Good temporal episode
19 April 2016 | by (United States) – See all my reviews

After the silly, dull "The Inner Light", TNG returns to form with this excellent, important two-parter.

When Data's head is found in a long-abandoned mine or Earth, the crew investigates, which leads to Data being transported to the 19th century.

It's interesting that even though Data has no grasp of contractions, he's able to speak French, which has mandatory contractions.

It's also nice that Guinan is finally given something to do. This episode starts to elaborate on the close relationship between her and Picard, but there are still many unanswered questions.

1 of 2 people found this review helpful.  Was this review helpful to you?

Message Boards

Recent Posts
Those Paramount Star Trek Fanfilm Guidelines in Full Doctor_Omega
Episode ? timmytony80
Is Worf the main character? bilyidol
Family ApesFollowKoba
A quick question about the First Contact episode Abner_Kadabner
Season 3 uniforms rigelmaccrikey
Discuss Time's Arrow: Part 1 (1992) on the IMDb message boards »

Contribute to This Page

Create a character page for: